Selection Bug?

This happens with any numeral box I deal with. While selecting numbers or anything in the box I sometimes get a grey selection instead of a blue one. The grey one is what I would call a null/pseudo selection. It out of my peripheral selects it but doesn’t I cannot change the number etc. Sometimes when you got to go fast it is a bit annoying especially since it can happen every time somehow. I think this could be an issue that needs fixing in the future it both slows down and sometimes screws up a project.