Have you just watered them? If not they are definitely too wet. I'm not sure but I think I can almost see some green algae - a sure sign it's too wet.

They are in jiffy pellets that I moved into bigger containers with potting soil, the soil is still pretty wet, it was earlier today. So probably just too much water all along? The petunias have been this way for a week or so. Everything else I have planted seems to be doing just fine.