checkout as guest continue button disappear on clicking

hi,all,

I am using 4.10 V of nocommerce.
During the checkout as guest, I found that the continue button disappear and I need to reload the page. This happened when I fill the incorrect information or left the required field blank.

I am using Emporio NopCommerce Theme . I checked the same in Default store theme but there it does not happened.

can anyone guide me in right direction

Thanks