Hi ! I still experiencing original bug (http://www.tvmaze.com/threads/1531/after-last-update-statistics-for-last-week-vanished). I didn't want to open new ticket for same bug, but original thread was closed (had to be offline for couple of days).
Let me reiterate with more detail: immediately after last update (acquired/skipped feature) i marked a lot of episodes (whole seasons) as acquired/skipped. I waited this update very eagerly. But unexpectedly: 1) daily counter got thru the roof (acquired/skipped counted as watched); 2) acquired/skipped appeared in "Last watched" list in my profile page. A lot of people experienced the same and reported this. It was fixed (http://www.tvmaze.com/threads/1518/acquired-vs-watched-watchlist-view?page=2#18184). After this fix acquired/skipped disappeared from "Last watched" list (http://www.tvmaze.com/threads/1518/acquired-vs-watched-watchlist-view?page=2#18224) and from statistics, but all over episodes that must been there disappeared too. At the time, i had no intention to bug you guys about it, because i assumed it was transitional database state.
Now to be as helpful as possible i compiled list of all episodes (~67) that disappeared from weekly/monthly/yearly statistics and from "Last watched" list. This episodes still marked in episodes pages/calendar as watched. My time-zone is DST+5 so dates should be accounted for that. As soon as i finish watching episode i always immediately try to mark it as watched to have exact statistics.
2016-06-23
http://www.tvmaze.com/episodes/636360/the-jim-gaffigan-show-2x01-the-calling
http://www.tvmaze.com/episodes/712546/the-jim-gaffigan-show-2x02-the-trial
http://www.tvmaze.com/episodes/820116/wayward-pines-2x05-sound-the-alarm
http://www.tvmaze.com/episodes/844428/baroness-von-sketch-show-1x02-last-year-you-werent-40
http://www.tvmaze.com/episodes/781327/guilt-1x02-americanpsycho2016-06-24
http://www.tvmaze.com/episodes/820116/wayward-pines-2x05-sound-the-alarm
http://www.tvmaze.com/episodes/817570/scream-the-tv-series-2x04-happy-birthday-to-me
http://www.tvmaze.com/episodes/828800/wrecked-1x03-always-meant-to-see-that
http://www.tvmaze.com/episodes/764796/animal-kingdom-1x03-stay-close-stick-together
http://www.tvmaze.com/episodes/808755/uncle-buck-1x03-ride-along
http://www.tvmaze.com/episodes/806387/barbarians-rising-1x03-revenge2016-06-25
http://www.tvmaze.com/episodes/778861/real-time-with-bill-maher-14x21-xiuhtezcatl-tonatiuh-paul-begala-michael-steele-and-betsy-woodruff-larry-wilmore
http://www.tvmaze.com/episodes/822652/vice-4x17-student-debt-fecal-medicine
http://www.tvmaze.com/episodes/834761/power-monkeys-1x03-episode-3
http://www.tvmaze.com/episodes/816108/agatha-raisin-1x03-the-wellspring-of-death
http://www.tvmaze.com/episodes/805269/new-blood-1x03-case-1-part-3
http://www.tvmaze.com/episodes/808756/uncle-buck-1x04-brothers
http://www.tvmaze.com/episodes/812268/feed-the-beast-1x04-secret-sauce2016-06-26
http://www.tvmaze.com/episodes/844780/maya-marty-1x04-ricky-gervais-and-cecily-strong
http://www.tvmaze.com/episodes/808720/cleverman-1x04-sun-and-moon
http://www.tvmaze.com/episodes/835102/power-monkeys-1x04-episode-4
http://www.tvmaze.com/episodes/684270/outcast-1x04-a-wrath-unseen2016-06-27
http://www.tvmaze.com/episodes/729575/game-of-thrones-6x10-the-winds-of-winter
http://www.tvmaze.com/episodes/774426/last-week-tonight-with-john-oliver-3x17-doping
http://www.tvmaze.com/episodes/832193/the-american-west-1x03-blood-and-gold
http://www.tvmaze.com/episodes/771034/rovers-1x05-bonzo-the-redbridge-rover
http://www.tvmaze.com/episodes/810023/private-eyes-1x05-the-six2016-06-28
http://www.tvmaze.com/episodes/828362/still-the-king-1x05-guess-whos-comin-to-dinner
http://www.tvmaze.com/episodes/831519/preacher-1x05-south-will-rise-again
http://www.tvmaze.com/episodes/820482/bad-internet-1x06-the-year-long-ad-experience
http://www.tvmaze.com/episodes/452608/the-girlfriend-experience-1x08-provocation
http://www.tvmaze.com/episodes/591627/portlandia-6x08-first-feminist-city
http://www.tvmaze.com/episodes/538720/the-shannara-chronicles-1x08-utopia
http://www.tvmaze.com/episodes/210815/spun-out-2x08-dude-wheres-my-client
http://www.tvmaze.com/episodes/591585/beowulf-return-to-the-shieldlands-1x08-episode-8
http://www.tvmaze.com/episodes/543941/superstore-1x08-wedding-day-sale
http://www.tvmaze.com/episodes/521494/shades-of-blue-1x08-good-cop-bad-cop2016-06-29
http://www.tvmaze.com/episodes/599767/idiotsitter-1x08-viva-la-joy
http://www.tvmaze.com/episodes/576135/shadowhunters-the-mortal-instruments-1x08-bad-blood
http://www.tvmaze.com/episodes/634249/not-safe-with-nikki-glaser-1x08-get-her-a-glass-of-water
http://www.tvmaze.com/episodes/525850/dcs-legends-of-tomorrow-1x08-night-of-the-hawk
http://www.tvmaze.com/episodes/645748/bordertown-1x08-santa-ana-winds
http://www.tvmaze.com/episodes/677926/the-family-1x08-sweet-jane
http://www.tvmaze.com/episodes/702570/heartbeat-1x08-match-game
http://www.tvmaze.com/episodes/694702/the-catch-1x08-the-package
http://www.tvmaze.com/episodes/778150/lady-dynamite-1x08-a-vaginismus-miracle2016-06-30
http://www.tvmaze.com/episodes/665845/wynonna-earp-1x08-two-faced-jack
http://www.tvmaze.com/episodes/667171/game-of-silence-1x08-hey
http://www.tvmaze.com/episodes/611397/supergirl-1x17-manhunter
http://www.tvmaze.com/episodes/578662/marseille-1x08-la-lutte-finale
http://www.tvmaze.com/episodes/506840/angie-tribeca-1x08-murder-in-the-first-class2016-07-01
http://www.tvmaze.com/episodes/526407/mad-dogs-1x08-broodstock
http://www.tvmaze.com/episodes/597686/life-in-pieces-1x17-hair-recital-rainbow-mom
http://www.tvmaze.com/episodes/597702/marvels-agent-carter-2x08-the-edge-of-mystery
http://www.tvmaze.com/episodes/589339/schitts-creek-2x08-milk-money
http://www.tvmaze.com/episodes/608543/chicago-pd-3x17-forty-caliber-bread-crumb
http://www.tvmaze.com/episodes/578504/grandfathered-1x17-the-boyfriend-experience
http://www.tvmaze.com/episodes/608544/law-order-special-victims-unit-17x17-manhattan-transfer
http://www.tvmaze.com/episodes/529216/man-seeking-woman-2x08-fuse2016-07-02
http://www.tvmaze.com/episodes/557565/colony-1x08-in-from-the-cold
http://www.tvmaze.com/episodes/606630/younger-2x08-beyond-therapy
http://www.tvmaze.com/episodes/608919/second-chance-1x08-may-old-acquaintance-be-forgot
http://www.tvmaze.com/episodes/578512/the-grinder-1x17-from-the-ashes
http://www.tvmaze.com/episodes/587107/the-magicians-1x08-the-strangled-heart
http://www.tvmaze.com/episodes/614068/dr-ken-1x17-ken-at-the-concert
http://www.tvmaze.com/episodes/604671/limitless-1x17-close-encounters
http://www.tvmaze.com/episodes/786177/after-the-thrones-1x10-the-winds-of-winter
I tried to unwatch/watch some episodes to see if it helped, for some it worked (i marked this episodes with asterisk).
Currently my "Last watched" list consist of this episodes (from first marked to last marked):
http://www.tvmaze.com/episodes/693348/casual-2x04-big-green-egghttp://www.tvmaze.com/episodes/589339/schitts-creek-2x08-milk-moneyhttp://www.tvmaze.com/episodes/597702/marvels-agent-carter-2x08-the-edge-of-mysteryhttp://www.tvmaze.com/episodes/597686/life-in-pieces-1x17-hair-recital-rainbow-momhttp://www.tvmaze.com/episodes/608544/law-order-special-victims-unit-17x17-manhattan-transferhttp://www.tvmaze.com/episodes/608543/chicago-pd-3x17-forty-caliber-bread-crumbhttp://www.tvmaze.com/episodes/529216/man-seeking-woman-2x08-fuse
First of this i watched and marked 2016-06-22, others i tried to change state from watched to unwatched to watched again.
