Cannot activate Ritual

2 out of 3 Rituals in Savannah cannot be activated. I portaled back to hideout before doing any Ritual. Apart from that only played the map. The first ritual I encountered I could start, Ritual 2 and 3 never became usable at any point. Tried going back to hideout, that didn't change anything. Cannot thing of any other information that might be helpful.

I just experienced the same problem I have 0 enemies left in my map and the last of my 3 rituals will not activate. Is it related to the stupid dune worms?...

Got the same MAP Crypt, can't activate 2 of 3 altars. 0 mobs left on the map