Lines when painting landscape

Hello everyone, I have a question regarding a particular issue when i paint the landscape: in some area the brush works fine, but over some lines on the landscape it doesn’t. I have already tried to restart the program, without success. I’m using Unreal Engine 5.0.0; do you have any suggestion to solve this? thank you in advance!

Are you painting over landscape in “empty level” ie. one that is generated in new project?
If its that, i am not sure why but there are multiiple landscapes in it, piled one over another.
So i suggest that you see tutorial how to make landscape, then create level from scratch, add your own landscape, and copy fog, lighting etc over.

Hello Nawrot, thank you for your reply! This is my first approach on Unreal Engine, I have just made it following a tutorial, and it was working fine.

A particular that I remember: when it was working fine, the entire landscape was selected, no issues found. After a while I noticed only section of the landscape where I pass the mouse was selected, and the issue started.

PS: Great avatar!

To make an example, here another image: