Fixed position + JavaScript issue with Safari

Question

I'm having a problem with some JavaScript that makes the rollover menu on the right (aligning with the tick mark) work on an Elementor site I'm working on. I had a another dev work on the JavaScript, and I didn't notice this error right away. Now I can't get ahold of him.

The right nav looks perfect and it does exactly what it needs to do in Chrome and Firefox. But I see now that the right nav and tick link does not work in Safari.

Elementor support was kind enough to take a look at it and they said, "...your page has custom CSS for the fixed layout menu and also I found a console error regarding a snippet for the dividers. It seems there is custom code applied to the Elemtor dividers to style the fixed layout menu. This is more a Safari and the custom code/CSS is applied to the page issue.

Despite there being a known issue with the position: fixed CSS rule not working as intended in Safari, I have seen people find a workaround to it. However, the fixed layout menu has many custom CSS and custom code applied. I wasn't able to find an immediate workaround for the many customizations you have.

The only solution I found was to remove the custom CSS position fixed which will depend much on the needs and requirements of the site."

Can anyone point me in the right direction for a fix? Have you come across this problem before with your sites?

Thanks in advance for any help. The site is here: [http://farallon-dev.com]