We have a serious problem with our site. If someone tries to update quantity in cart the product disappears from cart. This happens using the arrows to move quantity up or down, or if someone enters the quantity directly into the box.
It happens on the Cart page but also on any product page that shows the quantity currently in the Cart.
This is making it nearly impossible to take orders on our site.
I have disabled almost all plugins except the WooCommerce plugins. I’ve disabled security, optimization, SEO, etc. I’ve cleared transients and checked the database which has no overhead.
Finally, I tried activating a different theme and the problem was solved. But I switched back because using a new theme would mean recreating all the styles and look of our old site.
I could use some help in figuring out the problem.
Thank you.