Has this happened to anybody, and how do you fix it.

I have put my wmv files on youtube for the four games I am releasing.

On youtube, the files end where they are supposed to

However when I link them to my Itch.io pages, there is more stuff added. I do not even know where these files come from. 

They have nothing to do with my games, and keeping them seems very unprofessional. There is nothing wrong with them, just stuff I know nothing about.

How can I get them off, so my movies end when I want them to?

Thanks.