Hey Paul i found removing my announcement bar fixed the issue, although the announcement bar is quite important for us do you know if theres something i can do to keep it but stop the issue happening?
Make sure the announcement content is valid html or simply plain text.
Either way I’m unable to replicate the conditions so no idea what the issue is beyond trying to clear the cache, or some specific issue with your OS+browser combination and or browser extensions.
Try making a copy of the theme and check that, if a copy works fine that may point to cookies or an app issue.