Hello esingleton,
While viewing your website, you did lots of theme customization via CSS and PHP. So, we think that issues arose after the theme customization. So, we recommend you to consult with the developer who helped to customize this theme.
And while checking your website, its working fine here.
Please try by adding the below css codes inside Appearance > Customize > Additional CSS
.main-navigation ul ul{
margin: -7px !important;
}Hope this helps.
Regards