Whenever I take screenshots everything seems fine, but then when I wake up, in photos all my screenshots are doubled. Mixed in with each other randomly there are two copies of each screenshot. This always happens overnight some time, since I never see it happen. Anyone else have this happen?
Check any automation triggers you may have such as IFTTT.
Specifically it seems that iCloud photos may wait until overnight to sync, thus causing the IFTTT to not trigger until overnight.