ermm.... this is so weird.
I wanted to override CSS for the Login module and I only inputed this
#userdata
#form-login-usernameinto
and I accidentally saved the page. When I wanted to see in the front end what I had actually done I see that the margins between modules have been corrected...!!!
I didn´t get how this could possibly happen but would love to know if there is an answer

Cheers,
Erion