Here is the issue with the Sezzle Woocommerce plugin active using WPBakery Page Builder:
Here is a screen to edit the section in the back end.

When I click on edit, the edit screen is blank, both the VISUAL and TEXT edit screens (shown below)

However, when I turn off the Sezzle for Woocommerce plugin, I am now able to edit text in both the Visual Editor and Text Editor (Below)