@aldobelus I know about problems with #, please read my reply to you 5 days ago about my own investigation of possible causes, including about "there is nothing new".
Unfortunately, due to the Twitter-like approach in a server to client communication taken by GNU Social many years ago and even by Mastodon recently, notes and activities that look the same for a human eye, are represented as different by each server. This is the main cause of users' confusions seeing notifications about the same activities.
Hoping that the networks will eventually implement # "client to server layer" spec that resolves this deficiency, I plan to improve Notifications in # even in the presence of such unavoidable duplicates...
And another note: Looking for Notifications improvements, please make sure that you have AndStatus v.43.02 installed, see https://github.com/andstatus/andstatus/issues/456