ITunes won't transfer music to my iPhone 4S (iOS7)?

I'm not sure when this started, but I noticed that my random songs have disappeared from my phone over the past few months. I use my iPhone on a different computer than the one I started with, so it's not its "home computer" and I add music to it through the Autofill function. I recently noticed the absence of some of my songs and went into iTunes to add them back, but iTunes wouldn't allow the songs to be added due to the fact that they are, according to it, already on my phone. I have searched for them using the search function on my phone and can't find them.

iTunes seems to think that I have 900 or so songs when viewing my iPhone's contents through that screen, but my phone only has 700. ITunes is seeing songs that do not exist on my phone and because of that won't let me add them back. It's really bizarre and I'm frustrated and don't want to restore it because of how many computers I've gone through with my music data. I know I won't be able to get it all back if I chose that route.

If anyone could enlighten me as to how to get my music back/iTunes understanding what the actual data on my phone is Please do. Thanks!

Added (1). Also, viewing my phone through iTunes the problem songs are showing up with those exclamation points on the side. Really weird to see that in the phone section, and not just on the general music section.

Try amazing iphone transfer, compatible with the latest version of iTunes.

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