Aseprite F11 full screen weird pixels ratio

Aseprite v1.2.29 x64
Windows 10
1920x1080 screen resolution
It looks like weird pixel ratio isn´t a problem only for F11 as I am having that issue even without F11
ALTHOUGH, I am suspecting that the weird pixel ratio is actually the pixel Grid feature, as only the borders has this inconvenient
Here is what happens while pixel grid is active:

No active: