Usually this happens because your theme has an AJAX cart.
What happens is your theme updates the cart dynamically without reloading the page. When this happens the changes that Best Custom Product Options has made get erased.
The simplest fix is to turn On the Override AJAX cart option in our Settings page
- Go to your Settings
- Go to Override AJAX Cart (drawer style)
- Click On
If this doesn’t work contact us and we’ll fix the problem.