[Tournaments HMM V OFF] "Lord of the Golems"

Hey everyone, I've got a really cool problem here. When I cast the "Hornet Swarm" spell, my mana gradually decreases. It happens with each bee sting on the enemy. It wasn't like this before. I haven't installed any mods. I also haven't installed anything else that might interfere with the game.

Thanks in advance for your help!