Cannot save any fastw3b.com's FW Real Estate...

Joomla Module Manager works fine.

But if we use AMM, it won't save settings and, upon saving, resets them to default.

I've observed the following effort in the browser dev console:

Uncaught ReferenceError: jQuery is not defined
<anonymous> https://<clientwebsite.com>/administrator/index.php?option=com_advancedmodules&view=module&layout=edit&id=170&client_id=0:413
EventListener.handleEvent* https://<clientwebsite.com>/administrator/index.php?option=com_advancedmodules&view=module&layout=edit&id=170&client_id=0:393

I've notified fastw3b.com support, as I am unsure which end this will be on.

It is happening on two sites and we are working on Joomla 4/5 but I've noticed it happens in Joomla 3 too.