Disable placeholder link option not working for me

Hi,

I’ve checked the option to ‘disable’ placeholder links in the menu, and one of my parent items, ‘Portfolio’, is set to be a completely blank custom link.

However, when I click it in the select menu it takes me to a URL that is the current URL with the word ‘Portfolio’ appended.

When I check the option to remove the placeholder link, however, it works fine. But that’s not ideal for us, we’d like to have it there just as an unclickable element.

Any ideas why it might not be working for me?

Link to site

https://wordpress.org/plugins/jquery-responsive-select-menu/