It is perhaps a little early to be certain, but I think there may be a temporary issue with the way the iTunes Store handles hidden purchases. I've been noticing odd tracks appearing as duplicates in my iCloud library over several days, and now I find that I cannot delete movies or TV shows (they get removed then instantly reappear) and I also cannot get into the manage hidden purchases section under View > View My Account... Use Feedback - iTunes - Apple to let Apple know what you're seeing. At this stage I don't know if it is a universal issue or one that only affects certain users or stores. FWIW I'm in the UK.
tt2