Curly braces won't go to the right place

I already set code style from Allman braces, when I type such as 

if(){}

when I tap space between curly braces, it's supposed to be

if()
{

}

but it still 

if(){

}

Only after reformat code, the brace goes to the right place.

Is that a bug or designed to be like this?

How can I fix this?

thx