Touchscreen and "Open Stage Control" viewer looks different

I have two different views here on my touchscreen and on the "Open Stage Control" viewer.
On the "Open Stage Control" viewer it looks normal.

But on the touchscreen it looks like the red selected area on the left has not been adjusted to the rounding of the circle. It looks like the upper left corner has been drawn through with the lower left corner as a straight line.

I use the newest version 1.25.2

It's due to some appromixations I made to handle the circle's border which does change slightly depending on the size and the device. It doesn't seem problematic to me.

I tested it once with 4 segments, and it just has that little dent on the edge again. But as you say, it's only cosmetic.