Lock nut wont come off!!

Hey everyone, hope all is well.. I was doin some tinkering today and it seems my lock nut is really tight..im mean like REALLY tight..i`m gonna spray it and work it but i wanted to know if theres something i`m missing..i loosened it up to check the clip and make sure it was semi clean and not all rusted and stuff and now i cant get it back towards the tire to tighten it back up.. any input would be great!