Hi @shlomiobey,
I’m sorry to hear you’re having issues with your cart!
Could you please provide us with the exact steps I can take to reproduce the issue on your site https://obeyyourbody.com? I was able to add a product to cart without any problem so far.
Also, please reply back with the System Status report. It will help us determine what might be wrong with your site’s configuration. You can find it via WooCommerce > Status > Get system report > Copy for support. Once you’ve done that, you can paste it here.
Issues like that are usually caused by the conflict with either your theme or other plugins, have you tried disabling all plugins and switching your theme to Storefront in order to rule out a theme or another plugin conflict?
Cheers!