Hi @LaraCD one of the things that caused the issue in the OP's store was rogue code that was interfering with their theme build.
Have you installed any apps or had someone edit the code for your theme since you started seeing the issue? If so, you can use the method in my post above to revert that code back to before the issue started.
Hi @lanal24 It appears you were able to get that sorted. I see that your site has a functioning dropdown menu:
If you find yourself needing to check which code is causing any issues in your theme in the future, I would recommend creating a duplicate of your theme that you can troubleshoot on so as to not change the live site.