Comment box not showing

Hello to all the Catch themes team. I am new in this forum, but using your beautiful Gridalicious theme since years. I have a very big problem with the comment box that actually doesn't appear. In the preview of my post I can see the page perfectly, but when I publishe it and recharge the page there is no way to see any box area. I already checked all the sertings and allowed readers to comment, but no way! Would you help me please? I am going to buy the pro version but this is a big deal that i would like to solve it before upgrading! Thanks in advance for your support. Lorenzo