Jacob Kobryn

I put some new Rotowound strings on my fretless bass (squire vintage modified jazz) a few days ago. They sound, feel, and look EXCELLENT... but there is one problem, that I was hoping you could help me with. On the E string, it keeps rattling, instead of a nice clean tone. It is only the E that I have this problem for. I thought it may have been hitting the fretboard near the headstock, but it continues to rattle even on the mid\higher frets as well. It could perhaps be a problem with the string pot (I think it's called?) or the bridge. Either way, do you know how I could fix it? Thank you, Jake