One hour composition with hundreds of well lit video clips suddenly darkened

Hello Everyone! 

I have used after effects for color correction and rendering for an animation. I spent hours in after effects getting the lighting and colors just right. I have been working for days to create a final composition, which resulted in a comp that has a lot of clips. When I opened the project file last night, all of the clips were dark.I'd have to raise gamma by 2x on some clips to get even close to the brightness of some clips. Why is this happening? Is there any way to save days of work here? I re-imported one clip, and the lighting is as expected, so I'm left with an entire comp that has been darkened by premiere. Do I have to manually add and adjust each clip again?