What do you got when you tap on them? Its possible that your client doesn't connect to the relays these notes are stored.

There is a check before dispkaying the notification that validates that note is mentioning you, so I doubt it was a mistake.

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When I tap on them they ask to open a nostr client

I tap "amethyst" or whichever client I choose

Then opens as somethinglikes "URI not supported: null"

I'll take a screenshot/screen record next time for you to see from my view