Yes, there are too many ambiguities...
So: the conditions for #club5050 are to determine at least 50% of the earnings via Power Up within the last month (the last 30 days).

In your history it is just 7.3%...

The shared wallets are recorded from the time of entry on the Steem. Deposits to the same wallet as someone else may mean double accounts, perhaps friends or families. With the huge number of shared uses as displayed in your case, warning lights automatically go on: this is what farming accounts usually look like...

You have obviously paid into the same account (same memo) with hundreds of other accounts - even if that was years ago.

I see the club conditions as optional, so I don't see a direct problem. But if you use the tag, someone from the curators will check up on you at some point and respond.