When I go to this link:

Flash Company

which is the link you first quoted in your original promotional Mudcat thread, there's a playlist on the right hand side of the screen. If you click on the "Greenhouse Concert Oct 9, 2015" heading at the top of the playlist, it takes you here:

Greenhouse Concert Oct 9, 2015

which appears to be the main channel for your stuff. So it looks as though you've uploaded all your stuff under the username "Greenhouse Concert Oct 9, 2015" - rather than the username "Greenhouse". How that happened I can't say.

What I would do is delete all the stuff under the "Greenhouse Concert Oct 9, 2015" username, go to your proper channel name, i.e. "Greenhouse", log in and re-upload all the videos. Then re-create your playlist.

I think I'm right here, but others may have a better view!