I'd wait for Audentio to handle the fix but I suspect I'd be waiting awhile, and seeing as about 45% of my traffic is mobile, I can't wait.
Here's what I need: If you go to the Audentio/Reneue style page: https://www.audentio.com/shop/view/XenForo/reneue-34 and you reduce your browser window to 323 pixels wide or less, you'll see the issue - the sidebar becomes oversized and skewed right.
At 324 pixels? Renders just fine. But 323 and under, it gets messy.
I'll provide admin access to my XF installation so you can make the fix.
Paypal payment upon completion.