Sub Menu Not Appearing Safari Mac

I just updated the menu to the latest version and using Safari on Macs, the dropdown menus are not appearing.

see at : houstonmaritime.com

works fine with other browsers, and was working with the previous version.

I've made customizations to the theme color (blue), and tested by changing to a different color, but no change.

Dear greenkoi.
Thanks you for using product our,
I'm sorry. I checked your site, I didn't see megamenu on your site, Please speak for me, where use megamenu. I will check it for you.
Best Regards,
Huyen Tran