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Not really I'm afraid, I couldn't replicate it locally. Could you link me to the topic from your first post? Apologies on not replying, it's been a hectic couple of weeks and it's easy to loose touch of a thread - feel free to give me a prod any time!

Have you reverted to your old SP theme? No longer shows up as Reboot..

No problem, this should have been resolved sooner so it's really my fault.

It seems to be a bug of some kind, the padding for the offending section is set to padding: 4px, but if I change it to padding: 4px 0, it works fine. It's almost like it's shrinking the container even with border box applied.

This shouldn't affect any other browser, so I'll open a ticket and make sure it gets fixed up.

If you're running a child theme you will probably just want to add:

#spMainContainer .spTopicPostSection .spPostSection {
    padding: 4px 0 8px 0;
}

But if you do - keep an eye out to see if anything else is affected badly, I won't have a chance to properly test it and make the change until later.

OK, I've narrowed it down to a couple of things, mainly having either a flex-wrap in the wrong place, or having one container inside another with a wrap on both which either Chrome doesn't like, or it's missing a fallback rule somewhere..

Either way, the same stands I'm afraid I don't have time to properly test it right now, but give the following a try:

Add reboot-mobile.php stylesheet to your child theme, or open if you already have, and add the following under the first media rule (max width 2000px) -

#spMainContainer .spTopicPostSection .spPostSection {
        flex-wrap: nowrap;
    }

It wont have any adverse effects on desktop as the stylesheets and templates for mobile / desktop are split, but I've had a quick look at a couple of topics, including the text from your forum post which I worked from, and it seems to be the solution.

Will most likely get a better chance to take a look tomorrow evening.