Steps to reproduce the problem:
1. Watch YouTube on the browser and/or official app
2. Go to account history
3. See videos that I've watched previously 

What is the expected behavior?
See videos that I've watched previously 

What went wrong?
Videos show up in the history that I didn't watch myself. It's been happening for a couple of weeks now. Haven't had my browser open (or on auto play), checked logged-in devices: nothing concerning. 

Did this work before? N/A 

Chrome version: 66.0.3359.126  Channel: stable
OS Version: 8.1.0
Flash Version:
 

Deleted: Screenshot_20180504-230809__01.jpg 403 KB

	Screenshot_20180504-230809__01.jpg 403 KB View Download