Ok - I had this issue several year ago however I cannot remember how I solved it and I don't have the time right now to spend trying to figure it out.
I created a page layout that contains a title page (T) and a normal page (N).
When I open a new topic and apply the page layout's T page to it, is is automatically adding a second page to the topic that cannot be deleted.
I know it is probably something quite simple that I am missing. Help is much appreciated.