[Plugin: WP-Table Reloaded] Red Cross / Not Secure in Chrome

Hi, I’ve recently added SSL to my website and found an issue with WP-Table Reloaded. Using Chrome, on the pages I have a table on my site, I’m getting the red cross and line through https on the URL. This isn’t happening on any other pages.

I had a look at Chrome > Tools, Javascript Console and there seems to be an issue with WP-Table Reloaded not being secure.

I’ve checked on my Macbook and I’m not getting the red cross and everything looks fine. This is only happening on my Windows PC. Does anyone know how to fix this?

One of the webpages it’s happening on is here;

https://productlondon.com/audio-mastering/prices