Tapatalk needs to die in fire. We only still have it because a few people insist on using it but the reasoning escapes me. The mobile site is more featureful, better looking and isn't buggy.
So with regards to tapatalk issues: We don't even have settings in the addon that manages anything. The addon just picks up on the settings applied to the rest of the site. No one else is getting multiple notifications so it's not something that is site wide. There is a large movement of forums away from tapatalk for a variety of good reasons but the one I like to focus on is that you don't get the quality of experience the owners of their sites would like you to have. The percentage of users using tapatalk is actually quite small with about 85 - 90 % of our traffic being desktop use.