Hi, seems like theme or plugin conflict, please deactivate all plugin except woocommerce, WCMp and WCMp addons also change the default theme like twenty twenty. Test your site. If you found plugin conflict then please activate all plugins one by one and check continuously to find out the conflicted plugin.
Let me know what comes out.
My vendor dashboard add product inventory and etc is not working, Basically this is a plugin conflict, in order to detect which plugin is causing conflict- I activate each plugin consecutively and check the flow. Lastly the product inventory is not work when I activate elementor.
So I wanted to ask why elementor is not working and conflict to WCMP because 2 month ago I were activate the elementor plugin and same goes to WCMP plugins and addons, there is no conflict and WCMP product inventory works well.
Can you please share a staging site with vendor access, admin access, FTP for the debugging purpose. We will let you know after some investigation. Do not forget mark as private your reply while sharing the details.