Minor and not so minor shrines

[Cheomesh]

So I've just realized that in a few settlements, I cannot go beyond "minor" with some shrines. It varies settlement to settlement, as some have a full on shrine and others only "minor", with no more options to advance them. Is there a mechanic regarding this I do not know about, or is it a bug?

M.

[Carados]

The first shrine you build can be developed all the way up to the maximum temple availible. All the other shrines you build afterwards can only be built up to temple level. ^__^