MT4 simple question

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. So it moves from half to half. Anyone knows how to fix this problem?
Thanks

Maximize the MT4 window and also maximize the chart, and it should be fixed, was for me at least.

Thanks a lot. It is working fine now.