Shrine bug in maps

I have ran into what I think is a bug multiple times now, the bug being one of the following:

1. Shrine cannot be clicked immediately, requires either spamclicking or clearing all monsters first, but when it does work it grants 2 buffs; the one it is supposed to give and a second random one.

2. Shrine can be clicked immediately and grants 1 buff.

Sometimes when trying to press a shrine it does not give me the shrine buff, but when I spam click the shrine it eventually does work and instead gives me 2 buffs without me having any shrine specific stuff allocated anywhere. Initially I thought this was a feature requiring me to kill the monsters but sometimes it does work immediately before clearing all monsters and when it works immediately it also only grants 1 buff (as it is supposed to I think?).