Button does something weird

Hi there,

I am using the plugin ‘Woo product table’ and to make this plugin work I had to install the ‘Quantity Plus/Minus Button for WooCommerce’ plugin. But the button acts really weird and seems to add a bunch of ‘-‘ and ‘+’ characters before and after the amount in the center. Also when I use the +/- buttons, the steps aren’t going by one, but sometimes per 3 or per 5 and it makes adding products on my page almost impossible.

I have added a screenshot as a link to show you what I mean. The page itself is not live, but if it’s necessary for you to find out what is causing the issue, let me know and I’ll provide you with a link.

Thanks in advance.

Cheers,
Tom

The page I need help with: [log in to see the link]