CLion debugger shows wrong information for queue

I tried this very simple program ,  the debugger shows queue as "1,2" -> "1" -> empty after the pop().  It is supposed to show "2,3"-> "3"-> empty..

void testQueue() {
    queue<int> q;
    q.push(1);
    q.push(2);
    q.push(3);
    while(!q.empty()) {
        int elem = q.front();
        q.pop();
        cout<<"elem = " <<elem <<endl;
    }
}