Menu randomly disappears on Safari

This is the same issue as https://www.ads-software.com/support/topic/menu-randomly-doesnt-show-up/ and https://www.ads-software.com/support/topic/menu-links-not-appearing-sometimes/

Visit this page on Safari https://www.agleader.com/blog/four-easy-ways-to-get-started-with-agfiniti/ and refresh a few times. The menu randomly disappears until the user clicks on the menu, hovers over it, or waits a few seconds. Here is a video showing the issue: https://www.youtube.com/watch?v=4QWI64vnBoY

There are no JS console errors on this page, and the menu has a class of “js” as described in the other topics. This issue only affects Safari.

The page I need help with: [log in to see the link]