How to stop duplicate order from the signal subscription in MT4

 
I just subscribed a signal today.  The first 2 or 3 trades were okay.  It copied the signal provider's trades and only one position will be opened each time.  Then the system started opening duplicate trades.  Each time the provider opens a trade, my account will open 2 trades at the same price and lost size.  What is wrong with it?  How can I fix this problem?
 
 
I have the same problem, and it is happening intermittently. 
 
Hai Wei:
I just subscribed a signal today.  The first 2 or 3 trades were okay.  It copied the signal provider's trades and only one position will be opened each time.  Then the system started opening duplicate trades.  Each time the provider opens a trade, my account will open 2 trades at the same price and lost size.  What is wrong with it?  How can I fix this problem?
maybe the VPS migration problem
 
Has the terminal been updated?
Reason: