Long answer: The comments at AnimeSensi that I found were that gg-subs were not taking this series as seriously anymore, as seen in a lot of small errors getting through and some goofy original humor of their own being inserted.  Unfortunately, gg-subs is known for that sort of thing --showing their low opinion of a show or of the people that watch it by doing things that they [gg-subs] find amusing.  In the past, they have:
-Made up "translations" that have nothing to do with the original dialogue;  Sometimes a line or two, sometimes a whole script.
-Substituted their own music tracks;  
-Released whole fake episodes pieced together from random videos.  One such fake they bloated to 800MB on purpose just to make people waste their download limits.

Personally, I don't mind a joke as long as I know what it is, but what's fun for gg is seeing how long and how much they can get away with until people realize what they are doing.  This is what fansub folk call "trolling".  Read the blogs at their website if you're interested in watching this kind of stuff unfold.

In mitigation, I can only say that gg are among the oldest of the fansub groups.  They, and Koda their founder, did a lot to create fansubbing and speed-subbing as we know it today.  But She and/or they now get bored easily and often find more enjoyment in "trolling".  The solution is to enjoy or avoid gg.

In this case, there is another group doing this series, Asensi-Subs.  Click on the "Jormungand" link at the top of this page and you'll see a listing of all the episodes.  They're a little behind at the moment but should catch up soon they say.  They also recently announced plans to follow-up by doing the BD's for this series, so it sounds like they are still interested and making serious efforts with this title.  As you wait for them to catch up, you could review their version of previous episodes to see what you have or haven't missed.  As to Asenshi's file sizes, I have no idea.  But it's not a joke, in more ways than one.