You were banned for autoclicking, anticheat knows what you are doing and why you were banned. Yes, I was banned because for a while I set my right and left mouse buttons to left, I was then later banned on a diff account for the anticheat (it was a bug with the way it was detecting specific things) and eventually was never unbanned cause I was technically ban evading...
anticheat is correct 100% of the time, again I didn't get banned with the normal 17-20cps I can do with 1 button, when I started using two I got banned.
It detects various frequencies and if you set off a notification like that you are definitely autoclicking.
(Yes I've stopped using both left and right as left since then)