The sticky sub nav on my website works fine in webflow and when I shrink the screensize on desktop to mobile, but it is acting strange in the Chrome iPhone app…
I think you don’t need the section containing the “content-block” to be sticky. That might cause the bug. Also, if you want the “content-block” to be sticky up to the end of the vertical scroll, you may want to put it inside the page-wrapper directly instead of a section limiting the stickiness at some point.