Scrolling issue - Glitch/Jumping

[AdamStokes2021]

Hi,

I have a very small but very annoying glitching/jumping issue with my product pages. When scrolling down, there's a slight jump/glitch when the title of the product part of the page reaches the top, just before the sticky menu drops down to become visible on the screen. It's a very subtle jump and it's evident on all devices. I'd really like this to be smooth but I can't quite figure out the issue.

It isn't so much of an issue on computers, but for mobile it's very annoying.

Example page: https://infinitihome.co.uk/products/reclaimed-shoe-cupboard-coastal-chic

If anyone could help I'd really appreciate it!

Many thanks

[KetanKumar]

@AdamStokes2021 

sorry for any issue 

please provide video feather issue