Radio button in Ubuntu

I’m try sheetcam on Ubuntu and get a issue. All radio button can not show. I’m using Ubuntu MAte 18.04. Sheetcam still work fine. Just I can’t see the Radio button so a quite difficult to use.

In Ubuntu you have a choice of “styles”. Some styles will show the buttons, some will not. I had the same problem, and fixed it by opening the “Appearance” app in the Whisker menu, then changed the style from the default “Grey Bird” to something else, such as “Numix”.