Building with Bunifu Framework 5.3.0 on Windows 10. If I set the font size to 9.75 (WinForms designer always sets this if a value of “10” is selected for the font style) and run the executable with French enabled as the language and region for Windows then it appears to use the part of the number after the decimal point – in this example “75” which is obviously considerably bigger. It looks like Bunifu normally rounds this value to the nearest integer, so a simple workaround is to manually type in the designer properties to turn 9.75 into 10.
It might be helpful to note that I built my executable with English language/region enabled in Windows, then switched to French for deployment, as we were originally seeing this problem on a French customer’s system.