I went to Youtube and Sure enough, they were right! Someone took both my Pretty Fly for Battousai and Mahoro's Struggle AMV and put their own credits at the end. Then when I commented about it, they at first lashed out back at me that I was lying, only to apologize later. I decided to make my own account over on Youtube after that. I still see people claiming my videos from time to time on Youtube.
I also got this comment on my Excel Saga AMV:
I love this song and this AMV but I do know for a FACT that you didn't make this AMV! ¬.¬
A while ago on YouTube someone ((Can't remember their username)) made this and people kep copying and copying it, one of which was you. Then YouTube deleted them all, including the original and left yours since they on;y wanted one copy of this up and not hundreads. This is what happens to a lot of original videos.
It also has two thumbs up.

Also this guy: http://www.youtube.com/user/kuddlez