Delirium ends in Betrayal Research encounter

Hello GGG!

Im not sure if this is a bug or its me beeing unlucky but it happend 3 times in a row so i thought it could be a mistake.

In my mind the Delirium stops when playing an other encounter no?

If not its still weird, that it always seems to move away when im in the last room of the research underground, deciding what to do with my traitors.

Maybe its just an unlucky position where they go down but everytime i step towards them the counter for the delirium ending starts. When im moving away, it stops.

Could be that the fog is slighty to short so im steppin out of it when reaching the end of research?

Thanks for helping!