Categories not display

I just installed WordPress 3.4.1 on my local server and on my website

What is strange is that when I add a child category on my local server wordpress adds <ul class=’children’> to the html, but when I add a child category on my local server wordpress does NOT <ul class=’children’> to the html.

Localhost:
Category A
___Category A1
___Category A2
…..

My Website:
Category A
Category A1
Category A2
…..

How come? And how do I fix this problem? I just made a new theme and child categories does not show as child when I upload it to my website 🙁

Thanks so much!