What causes some products to be non-addable to cart?

Hi team,

I recently installed MonsterUpsells and have noticed that a chunk of my products can’t be added to cart anymore. This happens on both mobile and desktop, and includes dropshipped items from Oberlo, as well as products I have created manually and sell from home. The products that can’t be added don’t seem to have anything in common.

This is what comes up in the console:

Please send your site and if your site is password protected, please send me the password. I will check it for you.

Thanks very much, no password needed: https://cosplaykingdom.co.nz/

Hi Team,

The app developers have gone in and sorted out the issue.

Thanks for taking the time to reply, I really appreciate it.

Kind regards,

Jess