youtube embed size problem

Hi, I use wordpress 3.8 and experienced a strange issue. The youtube video　I embedded has a size problem, that is, it is too high.

The code I am using is:

[embed width="740" height="555"]http://www.youtube.com/watch?v=8BU1Vq-8nl8[/embed]

pls check it here: http://siluofake.com/?p=201

I searched internet and here but failed to locate same problem.

Thank you for your help.