I've some corrupted elements in my locale workspace before commit. Everything is right into NSF, but not in locale synch. Expecially a Java script library, in which some methods results duplicated (synch from nsf to on-disk create duplicates).
Which could be the problem?
Problem solved!
Be careful to have "Use binary DXL for source control operation" flag checked in Designer -> Source Control preferences.
Infact, it seems that if you don't have it, the export of the element lose some data.