[Jackson]

Can any guitar players help me. I recently got an el cheapo electric guitar and i have found that the 5th fret on the 6th string doesn't is a different tone to the open 5th string even when both strings are in tune when played openly. This is the same on all the strings. I have compared this to my classical guitar which is spot on. I think the frets might be incorrectly spaced and i was wondering whether this guitar is a dud or whether the problem is something fixable.