Well, today I printed my first photos and Im very happy with the results! But 4 of 24 photos have some blue lines, I dont know why... does someone knows why?
Looks like light leaks. If it is only 4 negatives, I would assume the processor/darkroom is to blame but agree with homburgers, we need a bit more information.
I'd like to see the negatives, but judging by the one print shown, it looks to me like the film might have been rewound in the wrong direction. Why this would only appear on a few frames, I'm not sure; the one time I did this myself, all of my exposures were affected.
The thing that I noticed first is that the lines coincide with the sprocket holes. That's why I think it has something to do with the film getting wound the wrong way.