Okay, thanks.
If anyone happens to catch the other kind of spell stickiness on video that would be great so I can see exactly what’s going on. I dunno if my theory is correct or not.
It almost sounds like it might just be there is a delay between when you submit the cast and when the server says “you successfully cast”, and you are just pressing the button before that signal arrives, so then you have to press it again to get it to actually cast…