As designed Alert notification bubble showed incorrect number

[Jeffin]

Hi, I am visiting xenforo forums after quite a while. On logging in, it showed me that I have 21 pending notifications within the red bubble above Alerts tab. When I opened it, I can only see 4 alerts starting from April 12 till today. The rest where probably deleted or something. Anyway, the alert bubble showed me an incorrect number on logging in. Is this normal?

 

[Amaury]

They're likely from threads or posts that are no longer available for you to see.

 

[Mike]

Yes, this is potentially normal when alerts are removed in bulk.

 

[Jeffin]

Okay Thanks for the explanation. I thought it would be a bug. No problem.