Yes it’s odd. I even put the 3080 on a riser. Not even in the big pci slot. Tried everything. Any suggestions? In amd software it even says my 5700g is the primary one. It doesn’t affect the 5600xt at all.
Confirm that the 3080 is actually working when gaming. Also confirm gaming performance with and without the 3080
installed to see if it makes a difference. You could also try different games to see if they all do it.
There might be something in the game settings for this.
I'm not a gamer so this is speculative.