Fixed element disappears on first scroll webflow, then reappears and works fine after first scroll up

Hello all,

designer here flying too close to the sun and making a mess in general but especially with animations.

I have a logo text mark and a logo image mark on the left side of the navbar. The text mark should disappear on first scroll while the image mark appears and stays fixed.
In the designer, it seems to work.
But when I publish it, on the first scroll down the page, the image mark disappears for a short time, then comes back if I wait or scroll up - and then it works perfectly just as I want it:

I can’t find out where I made my mistake…

Would be so grateful for help! Thank you :slight_smile:

Here is my public share link: [LINK](Webflow - Relaunch TURNS faserkreislauf)
(how to access public share link)