In one of my content-types i get a dublicate of the article each time it is saved. If i dont add another alias, it prints an error: another article in this category has the same alias. I use more then 10 different content types but this is the only one with this strange behavior. All are edited via frontend.
I dont want these dublicate article, because they show in related articles field. They dont show in List type.
So where do i have to look to solve this problem?