Why are my Yahoo! Contacts not on my iPod Touch?

Okay so I was having some duplication errors on my iPod touch and decided to erase my contacts from my iPod Touch. I went to Mail, contacts, and Calender. I went to my emial account and turned off my Yahoo contacts, deleted them, and them turned it back on. Usually, this puts them back on the iPod as before, right? Well, this time however, my contacts were not updated, as a matter of fact, they do not show up at all. I want to know, why? It was working before and now it is not. I am aware that I can just hook it up to my computer and go to info and check Sync Contacts with,,, but it was working before so I do not have to resort to that when it was flawless at first. Funny thing is, despite the fact that my Contacts are gone, deleted, disappeared, when I go to my email and type in a name, THEY SHOW UP! I do not know how or why that happens! To conclude, I really just need help syncing my contacts back to my iPod WITHOUT having to use the Info tab, which I've never before used till now (because I had no previous problem with it). Plus, why is it that the contacts still show up when I type in a name and is it possible to delete them because often they are duplicated? Thanks.