WPBakery Page Builder does not support 1/5 column currently. They might implement it in next releases though. When they do that we'll also adapt our code to be compatible with the Builder.
An easy trick to simulate 5 columns with the current grid is to select Custom and add a row with the following custom row configuration:
1/12 + 1/6 + 1/6 + 1/6 + 1/6 + 1/6 + 1/12
Obviously, leave the first and last 1/12 columns empty. On mobiles, you can return to full width and hide the 1/12 columns.