Laddawn.com : Length Change - Venting Enabling Issue

For Gusseted Bags, I entered a Width, Depth, and Length.  Once Length was entered, I see that Venting is Enabled (which is correct).  The I go into the Length field and delete the length.  Venting stayed enabled and shouldn't have.  Is 'WEB.VENTING.GROUP.ENABLED' being executed when length is cleared out?