Moving this to a discussion so I don't fill up the comments in it. What we have so far :

Barb-tan [author] 4 hours ago
Looks for what mod got updated last

challengingrealityagain 9 hours ago
I"ll try it, but I haven't changed my mod set up and it was working fine the day before. And did it and all it did was made it so that all the sprites were un-cuteified. It was just the Florans and the Humans.

BearSlashClaw 11 hours ago
There are many mods that can do this. Such as H.W.T.B.U.T and most of its sister mods. basically any mod that changes the body and/or headsprite can do this.

Barb-tan [author] 16 hours ago
I'm really starting to wonder what mod cause that bug, might be one that got updated lately

♥GoAway♥ 21 hours ago
@Challengingrealityagain
Usually this is caused by a mod conflict. Unsubscribe and re-subscribe to this mod so that it's on top of the load order. c:

challengingrealityagain Jul 22 @ 10:19pm
so, I've been playing with this mod for awhile now and its awesome. But for some reason when I loaded my game today my human character had reverted to non-cutebound appearance. Is there a way to force the sprite to use the mod again?

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So the most recent things to update were : Better Barren [plante generation], Frackin Universe, Starchef Redux [food], and Protectorate Furniture. So I'm going to start uninstalling one mod at a time and I'll let you know what's doing it. I"ll post when I know whats doing it.