These warnings probably mean that your password appears on the haveibeenpawned database
https://haveibeenpwned.com/Passwords

Read about it here
https://wikipedia.org/wiki/Have_I_Been_Pwned?

Mine is there. Every short word in the dictionary is there.

At least you post with a username, Dave. If only people were required to complete a capcha every time they post as a guest, or to identify images of traffic signals in a foreign country, mudcat threads would be much easier to follow!