About halfway down the left side of the panel it looks like the phases get mixed up. Look, it goes black, red, black, red, black, red, black, black, red, black, red.
If these are multi wire bracnh circuits that could explain the nuetral discoloration on
some of the nuetrals. If they are using 2 legs of the same phase and a common nuetral, the nuetral will carry the sum of both leg's current. It looks like this may have ocurred on the right side as well.
Just a thought.