Having a little trouble

Last night I was editing my favorites list and I edited my movies and I was able to do that and then I wanted to edit my favorite video games and I couldn't. Am I doing something wrong?

What do you mean by edit, rearranging the items or adding item or the actual edit page?

Adding the item to the actual page.

I've noticed that if there is more than a few items on the list it won't let me add. Like for video games I typed in the Sims and I can't add that but it let me add Siren.