On April 8th all of my videos were affected by a YouTube error/glitch that applied the settings for one of my videos onto ALL of them (and it definitely wasn't my fault, because there's at least 4-5 clicks that I would've had to have consciously performed along with various warnings before settings are applied to all videos. I only clicked on the checkbox for a single video and there was no confirmation box.).
I was able to get into contact with some people from Google/YouTube to see if they could rollback the changes, and, after a couple of days of them investigating, they told me they were unable to rollback the changes. As such, I am manually going through all 6000+ videos and updating them back to what they were before, or at least a close equivalent. I apologize for the inconvenience...on both of our ends...and I highly recommend that you use the playlists to navigate my Let's Plays/Videos until things are fixed as soon as I can possibly can!
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