that certainly is weird. The temple is what damia hints at so if you've beaten the plant girl boss then that should make the hint go away. Have you cleared all other hints damia gives? if so try going through the barrier southeast of the city. It's possible that the dialogue simply didn't update. So if you can proceed then you can be assured that you haven't missed anything.
that is, in the forest at least. The game is chock full of hidden content that you don't get any hints for.