Info
Affected version: 2.6.3 (probably more too)
Affected module: sticky header
Browsers tested on: Edge 110.0.1587.50, Chrome 110.0.5481.104, Firefox 110.0
OS tested on: Windows 10

How to reproduce:

1. Activate stick headers
2. Scroll down until there is a sticky header
3. Zoom in to at least 300% (Edge and Chrome), 260% (Firefox)
4. Scroll up

You will now have two headers. (1 sticky, 1 not), both are functional. If you zoom out, they will disappear.

Additional information
This is just a visual bug, nothing more. Also I don't know if only the site I was working on is affected.