MT4 question ragarding F12 function.

 
Hi guys,

I am using MT4 for manual backtesting. So I go back in time and start pressing F12 to move one candle forward at a time. But MT4 moves forward and stop at the half of the candle. The second half wont show until I press F12 again, but it will show the first half again form the second candle. So it moves from half to half. Anyone knows how to fix this problem?
Thanks
 

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