When I open up a Hidden Details when it’s in the last post of a topic, it opens anchored at the bottom of the hidden section rather than the top.
It may not be limited to the last post, but that’s where I spotted it.
I’m using Android and Chrome.
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Let’s see if I can replicate it here before I try and make a video. 
If you scroll this post to the top, and then reveal the hidden details, it opens from the bottom up:
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