Songs aren't syncing to iPhone 5 from iTunes?

I can't get a few songs to sync to my iPhone 5 from iTunes. I'm using a PC. I have the most recent version of iTunes and my iPhone is updated to iOS 6.1.4. The songs were downloaded from MP3Skull but I have a lot of songs from there and these files seem to be working fine. I actually had this problem the other night, and randomly it started to work and I got these two specific songs onto my phone. But somehow they disappeared. Now I'm trying to put them on my phone again. I have the manual, click-and-drag setting on. But when I drag the song to my iPhone, the text that says "My iPhone" just blinks and then the bar at the top of iTunes says that it is updating the files in my phone. So I checked the music on my phone anyway and the songs still are not there.

What should I do? This is happening with a lot of my music files.

This just started happening to me a couple of days ago as well and I have never had this problem before. I go to copy a song to my iPhone and it won't sync, yet the song plays fine on iTunes. Does anyone else have a solution to this problem? (I have an iPhone 4S)

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