Paint mode in segment editor works incorrect

I work with Slicer 4.11.0 , win10
The problem is: In Segment Editor Paint mode modify several slices together (see photo). If it is not an error, I would like to know, how to deny such modifications. In my work I need to modify only one slice simultaneously, and then use Fill between Slices mode.

This looks like the effect of a “Sphere brush” option in your Paint tool. Can you verify if it’s turned on?

If not, please provide details what kind of image you are working on.

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You are right. That was “Sphere brush” option turned on.
Thank you!