This happens when I used the skill and proc names in the title, it doesnt bother me much and I dont know what to expect with these illusions randomly spawning on my side.
Yes, that is normal. Mirrorcast has a delay so when it procs the spell, it will create illusions that are “randomly” placed. Where illusions are placed depends on the direction you are facing, pathable terrain arround you and skills used to cast.
