Why are there strange items in my watch history?
Your watch history is affected when someone (a family member, friend, etc.)
accesses your account.
■How to Delete Watch History
・Video: Click Delete all history
・Live Broadcasts: Click the delete history button or X button on a program
・Accidentally clicking an item
・A broadcaster is using a custom function during a broadcast
・A quick-loading tool or Firefox add-on is enabled
・NicoScript is being used for an item you watched or browsed (@CM or @BGM)