No idea.
Fat-fingered? Swiped sideways rather than typed? Accidentally hit the top right corner and triggered the mousedown on the side bar?
One of those things that is hard to reproduce as I've never seen it happen.
I get that as well on occasion (just did it then, jumped half way up the page). My fingers are not particularly fat. Not sure if my grubby bacon grease smeared iPhone screen is causing it.
@Ramsaye started
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No idea.
Fat-fingered?
Swiped sideways rather than typed?
Accidentally hit the top right corner and triggered the mousedown on the side bar?
One of those things that is hard to reproduce as I've never seen it happen.