Actually, the I think the grey speckled is supposed to be a marans hybrid too, but your hen doesn’t have pink/white legs like they’re supposed to. She may be the other one laying colored eggs.
The Devon bronze is probably supposed to be a marans hybrid, the golden speckled are supposed to be Rhode Island red hybrids, and the grey speckled is supposed to be a barred rock hybrid. Sounds like you got a bunch of types of Easter eggers (aka “Devon blues”) instead.