Hi @Alan_101 thank you for the report.
I first tried to replicate the problem using my iPad with iPadOS 16.4 with the Dropbox app window positioned as a “slideover” window, making it tall and thin (see first screenshot below). That worked OK, so then I tried the Dropbox app on my iPhone with iOS 16.4 and saw the problem that you describe (see second screenshot below). It seems very mysterious to get different results.
I then tried viewing tiddlywiki.com in the in-app browser in Mastodon on my iPhone, and again found that the problem was present. Then I tried the same experiment on my iPad with Mastodon in a slideover window, and again found that the problem was present. I couldn’t replicate the problem using Safari as a separate app.
These inconsistencies are frustrating. There’s no obvious differences between the iOS in-app browser and Safari.
I suspect that this is somehow related to a fix for the story river overlapping the search results dropdown on narrow screens that was included in v5.2.4 (the fix is here).
I am away from my desktop computer at the moment and so can’t use developer tools to investigate further. In the meantime, I’d welcome any further reports highlighting configurations where the problem is present.