Looked at the VTV of OPM in my mac-VM, and it is displayed correctly. Espectr0, could you please post another screenshot in which one of the checkboxes is checked? I am asking because if the VTV in your system is drawn in a 3d manner the bright lower right edges may be hard to see in the unchecked state. (However, drawing 3d checkboxes in macOS would be strange, anyway)
But I think the real problem is that you work on some kind of very-high-resolution display, and the VTV is not scaled correctly: The font in the VTV is much smaller than the font in the other controls. Unfortunately the monitor available in my mac-VM does not allow for scaling so that I cannot check this. Please file a bug report so that the mac experts can look into it.