iPhone Folder icons not centered?

[x-evil-x]

ive seen a few people post their home screens and the icons are either centered or not. mine arent and i want to fix this problem somehow. What size are the folder icons? same as app file size correct? where would the little folders be in the system?
Any help greatly appreciated.

 

[x-evil-x]

second screen shot is centered rest aren't

 

[x-evil-x]

Nobody?