Shape builder tool leaves weird paths
Hello!
I have a problem with shape builder tool.
When I delete, add or simply click to cut out a shape in the end I am left with some weird random paths.
I have no idea why it happens, or maybe this is how it's supposed to be?
If someone could explain it to me I'd be super grateful.


Those shapes were exactly the same size and in the same place. And look at those paths left underneath.
Why is that?
Thanks!

