u/Baynonymous

Can someone help if I'm missing something with the app? I'm using volcano's swift power (explosive eruption) to destroy one presence in the mountain. I've got 2 mountains and 2 fire symbols, so it should allow me to apply one damage in a land within range of one.

I've tried this three turns in a row now and it destroys my presence, but then doesn't allow me to apply the damage.

Has anyone else had similar or am I missing some hidden rule?