So I was a shaman but then my shaman spawn area thingy was bigger and
I didn't have the summoning range skill thing and I now have a larger summoning
circle!

Is this on all maps?

Theres a vanilla map that does this. You were probbably on that map.

Were you in the vanilla map where the shaman is stuck in a cage in the upper right hand corner ?

It map 10

there's 1 vanilla map that does this and a few non vanilla maps that change spawn range too, think of the likes of the UFO map, you don't have any spawn range in that! unless it's consistant throughtout all the maps it's probably intended by mapmaker and not a bug