Hello,
The options you show on the screen relate to the checkout page.
At he same time you show the Login/Register page. When you allow placing an order without registration it does not mean the Login/Register option is disabled.
This is Woocommerce functionality and WoodMart does not influence that.
As for the plugin, we have not tested the plugin with WoodMart and we cannot guarantee the full compatibility.
We would recommend checking the plugin in the Storefront theme, to see if the problem is caused by incompatibility or incorrect settings.
If you have any questions please feel free to contact us.
Best Regards