Acc tag - iTunes Library unsynced

Hi, I have this very strange problem:
when I try to change some data in some files through the iTunes (i.e. the "artist" field) I see it change in iTunes, but first time I play it it came right back to the wrong one. It happens also by telling iTunes to automatically find track data (it shows the right one, I play it and it comes back to the wrong one).
I tried this:
I opened the iTunes.xml library file, I manually edited the requested fields in the requested "files", but iTunes behaviour was the same, so I assume iTunes was just modifying the library but not the acc tags (even though I tried consolidating).
So I looked for an aac tag editor, I didn't find it, and resolved to manually edit the acc file through an hexadecimal editor. This thing worked (but I had to correct the data in the iTunes library to have everything perfect).
So, my diagnosis:
my iTunes can't modify some aac files (others just works), my library is in one single directory, all files have the same permissions, all files were encoded by iTunes, it happens both with files that have cover and that doesn't, it happens both with files with "ascii" and "strange characters" names, the filesystem is NTFS (through ntfs3g, but it can't be a direct issue of the FS because some files work).
Any ideas why this happens?

Even stranger behaviour: before trying what ed2345 suggested I did a library backup (just for being sure). Then I went to iTunes -> Archive -> Library -> Import Playlist and imported the xml backup. This way the "broken" album lost all accessory data (ratings, play count, skip count etc... what's the purpose of backup if it doesn't save these? O.o) BUT now I'm able to save tags for those files. It can't be a copy/paste problem since ed2345 solution didn't work (basically I wasn't able to save tags until I reloaded a previous library). In favor to the "file problem" thesis there's the fact that I can edit only the files I moved (the other "broken" albums remains broken).
To me it doesn't make sense at all, ideas?

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tt2

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Acc tag - iTunes Library unsynced

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