My alphabetic tags on my iphone music is missing,what should i do to make it back?

so i use iphone 4s,ios6.1.3,and after i sync my iphone to my pc to added new songs,it went like there's a few of ghost songs on my iphone (but i get rid of that already),but one thing i realized that the tags (that divide the songs' title that start with a to start with b) is gone,

the songs is alphabeticaly arranged but there's no tags to seperate/divide it,and it annoys me.

can someone help me? i appreciate you much,hoping for helps here,thanks! 🙂