Faulty "+", "-", "X", "gear" signs and boxes for Filter editors

The "+" sign next to Add a filter on the Ad Blocker tab is unequal pixels. I guess that equates to checkbox pixels? Also the "+" sign in add a custom DNS server on the DNS Protection tab is unequal pixels.
Moreover, in the Filter editors (DNS Filter editor too) and Parental Control blocklist and allowlist, the boxes below and the "+", "-", "X" and "gear" signs pixels are unequal. When I calculate the pixels of the boxes from the inside, it turns out to be 29x30 pixels. If these boxes are square, I think the pixels should be 30x30 (Since double pixel will be used, it must be double pixel).
I calculated the pixels of the signs in red and the edges in blue and wrote down the pixels. These signs and boxes should be equal and maybe checkbox too?

Ad Blocker add a filter "+" sign


DNS Protection add a custom DNS server "+" sign


"+" sign equate with checkbox


Boxes pixels in filter editors


"+" and "-" signs in filter editors


"X" and "gear" signs in filter editors