WP-Cumulus garbled display in Google Chrome

I use Chrome a my default browser, and this is the first time I’ve seen anything like this happen. My own blog looks great (or at least how it should look) in Chrome.

My guess is that this is one more variation in the way browsers handle little markup errors. (https://validator.w3.org/check?uri=https://arpitdave.com/&charset=(detect+automatically)&doctype=Inline&group=0)