After reading your response, I checked, and the problem appears to only be on Chrome on one of my two Macs. (It’s the one with an M1 chip, just in case that makes any difference.) It’s fine on Firefox and Safari, and on Chrome on my other Mac. But it’s weird: I’ve cleared the cache and all cookies and data associated with the site, and it hasn’t made any difference. I also notice there are a large number of javascript errors. The content looks like the style sheet is missing. And while it’s clearly ShareThis-related, it doesn’t appear to be the content on the current website.
Hopefully it’s just a local problem I haven’t been able to figure out yet.
Thanks for the quick response.