Font don't display properly on Oneplus 3 5 and 6 Devices

Fonts do not look right on the OnePlus devices.

No matter what i try the font on OnePlus devices comes out very weird, other apps on the phone look fine, the only app effected seem my app made in QT, other phones i have tried so far are not effected other than OnePlus, see pictures to see the difference, numbers are very thin, and all letters are capital style. On other phones everything looks right.