My Mexican Fender Jazz has a problem - when I play the open E string I get some really strange overtones that are loud. Its like I get an Eb harmonic on top of the the E-note. The pickups pick it up too! I've done some research around here and thought that putting some foam to the pickup holes where the nails go would fix it but it didnt. I guess the problem is with the bridge or the nut. Both look fine though! The bass is strung correctly and I have plenty of room between the strings and the pickups and intonation is good. My action is pretty low. Does the talkbass community know how I could get rid of this problem?