facebook chat not synchronising with laptop browser

now I have some problems with facebook chat.
when I chat on my phone sometimes I receive the reply only on my computer. I'm not sure If I'm online there but on my phone I only see a notice in the notification bar but not in my facebook application chat window. when I go to my computer the messsage is being displayed.

now I also had problems receiving / replying on my laptop. this was last week when I first used the facebook application on my phone. I'm not sure if this problem was for more users but something is not working right, at least the first problems.

does anyone have experience with this?

thanks