https://techcrunch.com/2018/02/14/apple-confirms-homepods-can-leave-marks-on-wood-surfaces-updates-support-page-with-notice/

Yeah, so this is a bummer. Now that the HomePod is out in the wild, reports have started trickling in from users complaining about the $349 smart speaker’s unfortunate side effect on wood furniture. A quick trip to Twitter shows various sorts of HomePod-sized rings left on desks and table tops.

Apple has since confirmed the issue on its support page, noting, “It is not unusual for any speaker with a vibration-dampening silicone base to leave mild marks when placed on some wooden surfaces.”