BTW, if both values of the year-field are the same and if you want to get rid of one you can achieve it for all with an action of the type "Remove duplicate fields"
Field: YEAR
Check "Only duplicate field for the same content"
There may be different causes for the existence of the doubled year in your tags, one of them is the possible use of Mediamonkey. This behaviour of Mediamonkey can be avoided:
https://community.mp3tag.de/t/double-records-in-year-ex-2012-2012/49830/2