Weird Lighting /Shadow issues

The following picture illustrates my issues atm with it looks like, lighting and shadows in my project .

Firstly, and oddly something I’ve never seen before, is weird sliver of shadow on top of char’s head, as well as the colors on various pieces of character.
I tried removing certain meshes from scene, doesn’t go away .

Lasty, as you can see the terrain texture has blotches of light that don’t go away no matter what changes I make.

Ideas welcome , as in the few years I’ve been doing this Ive never expeienced this, at least NOT in 4.22 as this pic illustratses, on right, that one is from 4.22 while left one 4.23 .