S - I have tried on both app and browser, with the same issue. The issue is not at my end.

I'm not trying to change that, I'm trying to add photos and that is the error message it is giving. There is not even the option in 'edit listing' to change anything to do with Christmas item, this is clearly a bug.

"For Unwanted Christmas gift: You cannot change the Unwanted Christmas gift on an auction that has bids." This is the error message.

I'm having the exact same issue