Same songs are getting re-synced every time

adding my voice on this problem: I also used grouping to sort DJ mixes, and my phone was (with the most recent iTunes update to 12.5) constantly re-syncing the same 76 tracks—all DJ mixes sorted as such.

I selected "use work & movement" for everything in my library, cleared out those fields, and also cleared out the grouping field.

then i selected everything in my library and de-selected "use work & movement."

presto:no more constant re-syncing.

You are the best.... Me, being such an experienced iTunes User, I was NOT able to track it.....
WORK AND MOVEMENT caused this issue ("work" and "grouping" field were differing)..... OMG... "WORK" not even modifiable for AIFFs, at least in iTunes 12.5.
LET ME ADD, that I first had the problem with only some 80 AIFF files....
within one week, it expanded to all mp3s with id3tag v 2.4 (750 songs). For these ones no problem (convert id3tags back to v2.3 within iTunes).

Addition to the problem is, that id3Tag 2.4 on mp3s can still not be handled by my ipod(s) classic, neither by the one with software 2.0.4 nor the one with 2.0.5. But this problem is only there for several years now... ("lyrics available, but canNOT be retrieved"....)

My solution finally was to remove the "WORK" field (CONTENTGROUP) completely with an external TAG editor (mp3tag.app) from the AIFF files - Any other options, losing my last played dates and whatever else, wouldn't have been an option for me....
Cheers..... YOU MADE MY NIGHT.... Thanks so much....

RIP Steve Jobs.....

Sorry for the somewhat useless post/bump, but I was also having this issue with almost 4,000(!) songs on my iPod Classic, and it was driving me insane. I use the grouping tag for artists who have been in multiple bands or produced/played with other artists, so I can easily make smart playlists that include all of their various projects. Clearing the "work" tag fixed it for me, too. What an unbelievable relief!

It's an annoying bug that adds yet another extra step to getting things to work properly in iTunes, but at least now I know to check for it any time I add new music or alter the grouping tag. Thank you everyone, this was extremely irritating and frequently stopped me from adding new music to my iPod unless I really needed it on there (and sometimes even when I did).

Now if Apple could fix it, that'd really be something. 😝

Amazing, it worked! Thanks so much to you and @risserfamily.

worked like a charm - many thanks

This fixed it for me... So pleased. It has taken umpteen tries and a number of days before I stumbled upon this.

This just made the problem worse for me. Now the number of songs that get resynced went from 400 to 7,000