Large text in Button captions

I have an app compiled on 2017r1. A few Linux (Ubuntu) and Windows 10 users are experiencing large text sizes on bevel and push buttons.
So large that the text doesn’t fit.
I have the font set to System size 0 in the IDE options. All the label and other font sizes are ok and everything looks fine in my test versions on these systems.
It appears to be something to do with the user’s system settings, but what?

I ever had the same issue in linux (Mint & Kali). its fixed by changing the font size to 11 or depend on your need. don’t leave it as 0.