Interactive Video - Drag N' Drop doesn't occupy the whole screen

When adding a a Drag N' Drop activity it doesn't occupy the whole screen. It only occupies a half of the video. This only happens if the activity is set to show as a button not as a poster.

Issue reported in: https://h5p.org/comment/17776

Sample content: https://h5p.org/node/171182

Additional notes: I initially created the Drag N' Drop activity using the poster settings saving it and edited just to change the setting to "button".