I come across this problem (http://wordpress.org/support/topic/subcategory-permalink-keeps-adding-parent-category-twice) that was submitted 2 years ago but has been closed unresolved and i can't seem to find a solution..?
Basically this is an example of my category structure -
Parent Category = making-cakes
Subcategory = sponge
Post Title = Making a Victoria Sponge Cake
So I want the permalink to look like this -
but i'm getting this -
Does anyone know how to stop it from doing this or why the permalink is only doing this to some of my posts?
My permalink structure is /%category%/%postname%/