There's a certain amount of words which came into both serbian and english from other languages, mostly latin, but have different meanings in each language.
Even native english words may mean something else in serbian, for several reasons:
1) they were misunderstood when coming into serbian
2) they were understood well first time, but changed their meaning in english in the meantime
3) they were understood well first time, but changed their meaning in serbian afterwards
Of course, there is also all the greek and latin which is wrongly used in english - just look up what "pathetic" originally meant, and check how it's used today.