In these days of Winter bash, I have observed that I have often two consecutive hats :-)?
It is normal or usual? Does this happen only to me or to other users as well?
These types of bug are not specific to TeX.SX, so you should report at the main https://meta.stackexchange.com, as bug reports here are much (much) less likely to be seen by one of the devs. That said, it has already been reported: Hat duplicates when info is expanded and After "run code snippet" winter hat image create duplicate image (no official reply at the time of writing this).