Sometimes it happens if you have ever used another account on that device. (Not necessarily account sharing...some people have alt accounts) It will sometimes give you notifications for your non-main account even if you have not used that account for over a year.
Only know this because it was addressed by a mod on the old forums.
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Yeah maybe it's just a bug or mistake. Seems to happen a little bit, not just a one time thing.
Only know this because it was addressed by a mod on the old forums.