Something went wrong with a loop

I created a 7 frame loop that varies occasionally, but is relatively simple. What went wrong was I started another layer and started animating on that, when I noticed the loop only showed the 3rd frame for the entire loop. I undid everything as far back as I could go, but nothing changed. I can probably redo it pretty simply, but if anyone knows what even happened I would love some insight.

Update: I redrew the missing frames and even tho the drawing was gone, the placement of the frames in the loop were unchanged so i fixed it easily.