[wpvideo tFnqC9XQ w=680]
VideoPress, especially as a video post format, usually provides some unique styling issues.
You will need to install Jetpack or Slim Jetpack plugin to turn the shortcode into a viewable video.
関連投稿
Post Format Test: Image (Attached)
Post Format Test: Status
WordPress, how do I love thee? Let me count the ways (in 140 characters or less).