Hi.. Woo works fine apart from the add/subtract products + and – buttons on this page:
however if you click on the 0 (zero) and manually enter a number, then the buttons seem to work.
I have tested this with the WP twentynineteen theme and the buttons work, so it is a theme issue. The product on the above page is a Woocommerce Grouped Product and as you can see the value is set to 0 by default, which is normal behaviour. Not sure if this is related to why the buttons dont work. Thanks.