So this has been going on for about a week. I'm not receiving notifications of comments directed at me on the Android app. Sometimes the red square over the notification counter does appear on the app, sometimes it doesn't, but I never receive a system notification, so it doesn't make my phone vibrate, etc.
This happened after I uninstalled and reinstalled the app because it didn't detect that I was logged in, so I couldn't vote on anything, edit my own comments, etc. The uninstall fixed that problem but introduced this one. I tried reiterating to no avail. Since this started happening I've installed an android system update, which I was hoping would fix the problem, but it did not.
I have version 1.0.89 of the app and a Samsung Note 5 with Android 7.0.