This is happening on all post pages, for example: https://wrydesign.net/other-projects/
The thumbnails seem to get off when the browser window is decreased, or when the window starts out at a smaller size due to the lower resolution of the screen it is being viewed on. It seems to happen on all browsers including Safari, Chrome, and Firefox, although I think the problem is more of an issue in Safari and Firefox.
I’ve tried adding some code to the CSS child theme to make the thumbnails responsive but I haven’t gotten anything to work.
Sorry for the delayed response