Hi,

I've checked your site, and the problem because one of your installed plugins/code has remove all the body class of Soledad theme, please go to Appearance → Customize → Custom CSS then add the following custom CSS code:

.navigation ul.menu li:hover > ul,
.navigation .menu ul li:hover > ul {
  visibility: visible;
  opacity: 1;
  -webkit-transform: rotateX(0deg);
  -moz-transform: rotateX(0deg);
  -ms-transform: rotateX(0deg);
  -o-transform: rotateX(0deg);
  transform: rotateX(0deg);
}

Regards,
PenciDesign.