x50i still counts wrong dive numbers

Why is the Garmin Dive app too stupid to correctly count the dives from the expensive X50i?
I’ve already exchanged half a dozen emails with support and have only answered their questions so far, yet I haven't received a single clue on how to solve the problem.

How am I supposed to rely on a computer and its app when even the simplest things—like sequential numbering—turn out to be an unsolvable issue?

My
cumulative dive number in the app is 284 (which is wrong also, and can not be edited) but my last dive was counted as no.104 (which is the number of dives with THIS computer).