WP Table Builder Ugly Black Surrounding Text while Loading

When I use this plugin to create tables & place said tables in a product page, I can see black outlines when I scroll to the tables themselves for a while before it reverts back to normal.

I know it reverts to normal in the end, but this black outline just looks ugly & can ruin the user experience as they wait for the tables to load. It can last for a few seconds to a whole 30 seconds. Any way to fix this?

Picture for reference: https://imgur.com/a/WvZKaci

The page I need help with: [log in to see the link]