Last year, yearbook was a class but this year it is now a club. Im planning to do yearbook again this year. Should I list it as an activity for two years or just list it as one and they’ll see the first year on my transcript?
You can list it for both years.
Would that be, in any way, confusing to the admission officers, espcially since it’s already in my transcript?
Not at all
Definitely list any activity that you’ve spent a lot of time or have a completed project/award etc. There is only 150 characters on the Common App for activity descriptions, so while you obviously don’t need to explain to Admissions what a yearbook is, explain your duties (sections, fundraising vs. photography etc.)