Hey Guys,
I may have located the source of this issue. I believe it may be related to the Header Block in the Organic Blocks plugin. I updated the plugin, removing any updates the plugin makes to the site title and tagline.
Please try updating STAX and Organic Blocks, and let me know if it resolves the issue. If you’re hosted on WordPress.com, the theme and plugin will automatically update within the next 48 hours.
Thanks!