I would contact the supplier you bought it off.
this is more of a problem in sited machines with these displays, at least 3 of the 6 machines at the local timezone has this problem, even on there Metallica machines
I have even seen a HUO AC/DC with this problem
I am not going to be liked for writing this post but it is true, I will take some photos next time i am next time i go to time zone