why is my private device showing as a managed device?

Provide screen grabs of what it is that makes you think they’re managed if you can.

Did you purchase the devices from a reputable source or were they given to you? You’re now retired but did you use them at work ever? Have you connected to a large enterprise’s network recently?

I've read all your subsequent posts with interest and all it proves to me is your AppleID has been compromised. Best thing you can do now is sign out of all your devices - if you're able to; create a new AppleID with a much stronger password than one you used before, erase all your devices, sign back in again with your new AppleID and start again.

Showing where?

What exactly do they say, that makes you think they are managed?

Provided details and context and someone may be able to help.

You've marked this as solved. However in an effort to aid others with a similar question it would be helpful if you mentioned what it was that solved your question.

Thank you.