ITunes thinks iPhone has more music than it really does, and won't sync

Question

I have an iPhone 4 running iOS 7.1, and am running iTunes 11.1.5 on Mavericks.
I was using iTunes Match on the iPhone, but I don't want to do so any more because I have acquired a lot of music that I can't upload to iTunes Match. (This is because my wife has her own iTunes Match account, and Apple won't allow two different iTunes Match accounts to be used simultaneously on the same computer, even under different user accounts. So because my wife uses her iTunes Match account under her user account on the same computer, I cannot activate my own iTunes Match account and upload my additional music.)
So I turned off iTunes Match on the phone. I then went into Settings - General - Usage - Music and deleted all the music on the phone.
The phone now shows as having no music on it at all, both in Settings and in the Music app itself.
I hooked the phone up to iTunes in order to sync a new load of music onto it. Under "Summary", the usage bar shows no music on the phone at all, and a total of 10.99 GB free. This is exactly as expected.
I have ticked "Sync only checked songs and video". In my iTunes library, only ten songs are checked. So I am attempting to put only ten songs onto the phone (for now).
I go over to the "Music" tab of the phone. I check "Sync Music". Suddenly a huge blue bar appears at the bottom, and it now says I'm over capacity by 975.8 MB. And yet at the top of the screen, next to "Sync Music", it also says "10 songs". So it knows I only want to put 10 songs on the phone, and yet it thinks that this is too much for the 10.99 GB free space on the phone.
Heading over to the "On This iPhone" tab of the phone, I see that all of the music that I previously deleted from the phone is showing up here, even though it's no longer on the phone. If I double-click on any of the items, they don't play, and an exclamation mark symbol appears next to them, indicating that the tracks aren't actually present. If I right-click on any of the items, the only options I have are to play them, get info, check the rating, or show in iTunes Store. There's no delete option.
It looks like, as long as I don't try to sync the iPhone, iTunes recognises that there's no music on it, and it's got over 10 GB of free space. But as soon as I try to sync it, iTunes thinks that the old, deleted music is still on it, and that I therefore have no space to put anything more on. So it refuses to sync any music to the phone, even though there's plenty of space for it.
I have tried ejecting the phone, restarting it, and remounting it. I have also tried signing out of my account on the phone and signing back in. It makes no difference. I don't know what else to do.
So I can't sync the iPhone. What's going wrong, and what can I do to make it work?

Answer 1

Same problem here. Mine is a iPhone 5s......