Hi, @divoon

On what version of WordPress do you remember your theme was working? What version did you upgrade from?

1. This may be a plugin or theme conflict. Please attempt to disable all plugins. If the problem goes away, enable the plugins one by one to identify the source of your troubles.

If you want to make these changes only for your eyes, without affecting normal visitors to your site, install Health Check PluginOn the troubleshooting tab, you can click the button to disable all plugins just for yourself, while you’re still logged in. You can then use its admin bar menu to turn on/off plugins and themes one at a time. See https://make.wordpress.org/support/handbook/appendix/troubleshooting-using-the-health-check/ for more information.

2. But my guess is that your theme is not compatible with the latest version of WordPress.

Please try installing Enable jQuery Migrate Helper plugin and choose Legacy for jQuery Version to see if that fixes the issue. This plugin is a temporary solution to give your plugin and/or theme authors time to update. If the plugin helps, please contact the developers of the plugins or themes noted in its admin messages.For more information on what this is all about, see https://wptavern.com/major-jquery-changes-on-the-way-for-wordpress-5-5-and-beyond

Since you use a commercial theme (Foodmood), please go to their official support channel. We feel they are best equipped to support their products.

https://themeforest.net/item/foodmood-cafe-delivery-wordpress-theme/24702614/support

Forum volunteers are not given access to commercial products, so we would not know why your commercial theme is not working properly. Commercial products are not supported in these forums.

Hope this helps,
Kind regards!