Can confirm the updated patch in #7 is working well, thank you.
Thank you, I can confirm that the patch in #2 solves the issue for me.
In the slim chance that there's anybody else out there still using this old version of the module, I found that using "drush rr" (registry_rebuild) usually fixes this error for me whenever it occurs.
The issue happens for me on all browsers I've tried. For example, Chrome on macOS Version 110.0.5481.77 (Official Build) (arm64)
And also Firefox on macOS Version 109.0.1 (64-bit) -- see attached screenshots for reference.
To reproduce this issue, I start with a maximised browser window and gradually reduce its size until the redundant sticky header appears.
Can confirm this is happening for me too. It seems to occur for browser/screen width between 976px to 1145px (inclusive).