Reply To: Issues with quantity and add to cart button

Hello,

You have customized the product page considerably.

Please deactivate all the plugins except these ones:

Slider Revolution
WPBakery Page Builder
Woodmart Core
Contact Form 7
MailChimp for WordPress
WooCommerce
Safe SVG
Switch to the child theme and check.

If the problem has gone, activate the plugins one by one, checking the issue to detect which one causes the problem.

Best Regards