Hello Irwan1976!
The title of this video is irrelevant to its content. What we can see here is commonly called slippage. Slippage may occur due to the lack of liquidity behind the requested price or when it's been taken by other traders' orders or due to the market gaps. Moreover, slippage can be both positive and negative, and OctaFX cannot influence this factor.
Best regards,
OctaFx Rep.