I visited your form and the table includes all its borders. Please look at the screenshot image below:
So, I assume the issue is related to the styles on your public website. Please enter the style definition in the form settings with the !important; modifier.
The issue is not caused by the plugin but a style defined in the theme active on your website.
Unfortunately, each time I visit the URL provided (https://app.ucimhef.org/ecog/) to check the styles, your website redirects me to the homepage. Please watch the following video:
If you don’t want the styles in the theme to affect the styles in the form, you can try to load the form into an iframe by passing the iframe attribute through the form’s shortcode:
If you want to overwrite it from your form, enter the style definition below through the “Customize Form Design” attribute in the “Form Settings > Advanced Settings” tab: