Tapatalk is a third party plugin, and the forum doesn't know if the changes will break tapatalk or not, which is why I've never recommended relying on it for your needs. The forum (when it works properly) renders really nicely in a mobile browser so you can always use that instead. I may need to check if there is an update to tapatalk that needs to be applied.
The double posting happens as a result of you pressing "save" more than once, probably because the forum is slow and you imagine that the first time pressed didn't register properly.
As for the updates, there was a major update a few days ago, and another security patch after that. Server performance was in the drain and applying the upgrade was a challenge in itself but it's been pretty stable since.