Dear all,
I think I have found the solution to the problem. Today I was in my studio to work on the Logic song. I opened the file and there were no more unwanted folders. I realised that it was a system incompatibility issue. At home I run Logic 10.5.1 but in my studio I run Logic 10.3.3. (because I use an old Mac Pro) Logic always warns when I open a song that wasn´t created using the same version but so far there were no problems. Until now. Thanks for all your input and sorry for having wasted your time.