Visual Composer with High End

I’m having a lot of trouble inserting a background video with visual composer. I made a new row, split it into three columns, put a fullwidth section in each of the three sections of the row, and then uploaded and added a different video to each of the three sections but no luck. Am I doing something wrong?

Also, one of my fullwidth sections doubles all of my contect and doubles in length as well even though all the script is okay. What am I doing wrong? How do I fix this?

Any help is much appreciated