Sounds like what your hearing is a close frequency bleeding over on 159.0450. If they are almost out of range there will be alot of static instead of distortion. Next time you hear someone on that frequency quickly tune to 159.0450 then go up and down a step or two and see which one is clearer.
I have a neighboring counties repeater that is close to my counties fire dispatch. If I dont have the PL code programmed in, it will bleed over and I can still understand them but its a little distorted.
Pro-106 / Pro-197 / Uniden BC92XLT / Uniden BC355N