From memory, you do have to be a bit careful when loading the film. Press your fingers lightly on the paper backing as you first wind it on to the take up spool. You want to have a little bit of tension so it winds tightly from the beginning. I used to do that and never had any sort of light leak or loose rolls.
You should see clearly if you have a loose roll when you remove it. The sort of thing you see with Holga & Diana. Even then it should mostly affect the edges, I don't see how it could fog right across the film.