Hello,
We have enabled the default WordPress theme (Storefont) and found that the same issue persists https://gyazo.com/84ea1bc6b7d3f674d08cf7b47869699e
It meant that our theme is not a reason of the problem. Maybe this is something with WordPress or WooCommerce, we are not sure. Try to check the server error log, maybe it will help you to sort out. Our support can help you only in case the problem is caused by our theme. Try to contact WordPress or WooCommerce plugin support to get help with issues related to default WP and plugin options.
Regards