Menu button CLS issue

Hi guys, new here. After a little bit of advice/help if I can please.

I'm currently working on my website on a staging site before pushing live. I have a button in the header menu from divi pixel that seems (I think) to be causing a flash/cls issue on the page load. Previously I was using the divi builder to make the header but scrapped that after finding too many issue and am instead using the standard header with some modifications from divi pixel/custom css + wp front notification bar. Also using WP rocket and perfmatters.

Without the button I seem to be getting a better performance score on desktop - in the 90s. With the button it's dropped into the 80s. I'm getting the flash/quick rearrange of the page as it loads and it seems to be logging as a bigger CLS number in google web vitals/gt metrix.

Any ideas on a workaround? I've tried: https://www.markhendriksen.com/how-to-fix-divi-flashing-unstyled-content-on-page-load/ but it doesn't seem to help me. Ideally I would like to keep the shop button in the menu.

Thanks guys.

https://actiontkd1dev.wpengine.com/