2d animation renders certain layers without color; all black

I have an 2d animation with four layers, and two of the layers, all the grease pencil marks in color render black. in the viewport in blender, everything is colorful and vibrant. when rendered, two of the layers replace the color with black, leaving the other two layers in full color.

I can not find anything on the internet to fix this or give incite to this. I tried all the simple fixes that were suggested. pls help. I spent a lot of time on this animation. 4k frames, with four layers.