First, I opened the camera a few days ago to put a roll in it but this roll was already in. First light exposure.
Second, I finished the roll and rewinded it, opened the camera and SURPRISE, the roll was still there. Second light exposure. What happened is that the roll just got out of the roll so it didn't rewind, I had to do it manually.
That explains the light leaks, but despite of that, I'm really happy with the results as I am still a beginner with this camera :)