There are only three episodes, but someone added three more, because those three episodes were shown in two parts each, 120 minutes in total for an episode
Fixed it and messaged the user :)
Thx for noticing!
cheers
Juan
Syfy does that for several of its "event" series: originally shows them as three one-parts, and then breaking each one in half later in the UK or on DVD release. They did the same thing with The Lost Room, and I suspect they'll do it for the upcoming Childhood's End and The Expanse.