I tried this on your Reykjavik demo page and it was all ok.
I’ll be very thankful for any help. Keep up with the good work! :)
I’m sorry, but this issue is not related to the theme.
I can’t reproduce your issue using WooCommerce plugin, so I guess the issue is not related to that plugin either. But please double check the plugin setup and you can also ask for help on WooCommerce support, they might be able to help.
Also, try to check your other plugins. Maybe one of them is messing things up a bit here.