I just summoned the stone lizard companion, It happened to be a brown bear instead of a stone lizard. I don't know why that is.

I have this problem too...checked with another druid who has the same companion and he has it too.

Familiars and animal companions need to be restored to their underdark variety / EFU-nerfed-state. Please do not summon them until further notice.

You are now free to summon your pets.