Hi,
thanks for your post, and sorry for the trouble.
From what I can see, this is caused by your theme. It is loading its own (and very old) copy of the jQuery JS library (the file /wp-content/themes/Pang/js/jquery.js) instead of using the up-to-date version that ships with WordPress. This is a very bad practice (and actually prohibited for themes that are in the official WordPress theme repository).
You should therefore check if the theme developers also offer a proper version that does not do this. Otherwise, you’ll have to look into fixing this problem yourself, e.g. with these pointers: https://tablepress.org/faq/js-functions-not-working/
(Note that this is not just a problem with TablePress, but with other plugins on your site as well. Using the error log console in the browser, I can see multiple JS errors that are caused by this problem in the theme.)
Regards,
Tobias