text-size-adjustis causing this. I believe this was done to overcome iOS issue with unexpected font size increase, but on Android it does exactly the opposite by triggering it. This line is not needed at all, because this bug is already fixed with the meta tag:
<meta name="viewport" content="width=device-width, initial-scale=1">
Would it be possible to remove this rule entirely and still have disabled font boosting on iOS? Removing that rule seems to fix the issue for me, if it's not causing problems on iOS it should be safe to remove it. Also, meta tag needs a tiny update: https://bitsofco.de/ios-safari-and-shrink-to-fit/We haven't actually been able to reproduce this... we could add text-size-adjust: none to the core CSS, but I'm not totally convinced it's necessary?