Hi, ncomstoc!
I'm glad you liked the game. Look, this occurrence is possibly related to the animation or the sequence of movements that the character takes when executing the "Multi Shock" skill, maybe it is a coincidence that it only happened to you with the Great Lighting Staff equipped, there may be other factors that should be tested. I remember that it happened to me while I was creating the game, and being a low level mage, that is, with cheaper weapons.
However, now after reading your comment I have tested it a large number of times and it has not happened to me. I could change the animation of that skill and that would solve it.
If you have suggestions, comments or curiosities please let me know, I will answer you if it is at my disposal. If you liked this game you might also be interested in my newest game "Astraeus - Path of the Chosen". Thanks for the comment and for playing!