I'm using Ubuntu 16.10, with MATE. For some applications, the Qt styles look something like this:
For a given application this happens consistently, but I can't figure out what makes this happen to certain apps. These copies of Fritzing and Robomongo are installed locally, in my home directory.
This is Fritzing, installed from apt-get. Nothing is wrong here, this is how I want it to look.
What's going on?

