I don't watch this series so I don't know everything there is to know. But from what I have gathered all of the episodes listed under "Season 7" are really Season 6 episodes. Episodes under "Season 8" are really Season 7. And the episodes under "Season 9" are really Season 7 or Season 8. This is the season that is airing currently.
Also there are two different episodes listed in the same 8 pm time slot tonight which is causing a scheduling conflict. That's what brought my attention to this series which lead me to find all these other problems.
TV Guide is erroniously calling the current season "Season 9" so I think that's where that problem is arising from. I think it's really Season 8. http://www.thefutoncritic.com/showatch/sister-wives/listings/
It looks like there have been a lot of edits to this series. I figured I would leave it to someone who cares more about this show than I do.