Hello,
I checked out your site and I see the issue.
I found the problem.
You will need to edit the the style.css file on line 667.
Delete the display property for the following selector,
.main-navigation li a {
display: block;
padding: 0.5em 0;
text-decoration: none;
}
Once you’ve deleted it, it should look like this,
.main-navigation li a {
padding: 0.5em 0;
text-decoration: none;
}