Created attachment 113530 [details] this is the problem. I am using Huion H610 on a MacOsX. Whenever I draw in Krita, random lines just keep appearing when drawing normal lines. For example, if I draw just a normal straight line, another line would just branch out and it goes for the same with circles.
I'm sorry but this is a bug in Huion's driver that we cannot work around. We can reproduce, but not do anything about it.