Table tools/wrapper not showing, table style errors, console errors

The client was using this plugin when we started working with them. Yesterday they informed us that tables weren’t showing correctly on the site. After some exploration, I find that:

Setting the table to hide until fully loaded in the display options sets the table tag to display:none. Unchecking this options removes display:none.

The table wrapper div isn’t present at all. In the official demo, this wrapper is
<div id="table_1_wrapper" class="wpDataTables wpDataTablesWrapper"></div>
The wrapper div should contain child divs, buttons, inputs and other elements with classes to call styles on the inputs and table.

There are two console type errors for jQuery.url() and jQuery(…).animateFadeOut. It’s saying these aren’t functions and they are coming from the plugin’s js files.

They are running version 2.6. Any recommendations or known conflicts? I’d appreciate some help getting this resolved.

Edited to add: PHP is 7.1.3

• This topic was modified 4 years, 9 months ago by Janine.
• This topic was modified 4 years, 9 months ago by Janine.

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