When I lock my phone (Note 4 running Android 6.0.1) and unlock it awhile later, often, everything will have become huge:
To fix it, you just need to restart the app, but it's kind of annoying.
I can't reliably reproduce it. It's just something that happens at least once a day. I'm guessing it has to do with leaving the app open when I lock/sleep my phone since it only happens when the app is the first thing to open when I wake it.
The app is version 1.0.89.