1) Hotel reservation for Marriott - Norton claims is "risky" (calendar invite)
2) My birthdate - Norton claims is "risky"
3) Calendar invite for Airbnb reservation for vacation - Norton claims is "risky"
iPhone 13 Pro running Windows 11
I just mentioned Windows 11 as I sync my IPhone to my laptop.
Interesting that you can run Windows 11 on an iPhone??? 
Maybe that is your problem!
But seriously. I have seen odd behaviour with the calendar warnings. I got a warning for Father's Day. I reported this to Norton, but have not heard anything back on this.
I'll escalate this thread to add your information to mine.