Hello @FRESHOPP FRESHOPP, Sorry to hear that you have faced an issue on your end. It seems like there might be some theme/plugin conflict on your end.
Just to be sure deactivate all plugins except WooCommerce, MultiVendorX and MultiVendorX Pro on your end and switch to some default theme such as twenty twenty four or storefront and check if the product is appearing in the “All products” page in the vendor dashboard.
Also if the issue persists with the plugins deactivated and the default themes please do create a staging site where the issue is replicated and share the staging site URL, temporary admin and FTP access of your syaging site with us so that we can check the issue on your end and help you accordingly to solve that.
While sharing the access don’t forget to mark your reply as private.