Distrusting developer is a good approach in general but assuming you actually agitated during development, I'm not sure how you would get some regions developed and not others. Bad dev tends to be all-bad.

Often when you get film sticking together, it's really obvious because the fixer is also excluded and you end up with big ugly milky patches on the film. Did you see anything like that? I'm not sure how you could possibly get stuck bits with 35mm in a Patterson tank but I could imagine it occurring with the film skipping tracks on a stainless steel tank.

Seriously, any image you can post of the offending negs would tell us a lot, even if it's a crappy cameraphone shot.