KYLE brushes issue

Hello,

I keep having issues with Kyle's brushes and also with the erasers (it is possible that is not an issue specific to Kyle's brushes but to brushes in general). 

The issue is that I keep getting this 'built-up' or weird circle with a kind of texture, please see pictures below. Also in the eraser, I get plain circles randomly when I just erased a straight line. This is all very annoying as I have to go over everything many times to remove all these weird circles...

Also, I have seen that it happens in other people's photoshop too.

I use the latest Photoshop version and the latest MacOS Big Sur latest version on a mac book pro. And a Wacom Intous tablet with all drivers updated. 

Please let me know what is wrong and how to fix it. 😞