I can usually pin issues like this down to browser extensions interfering with the designer. If you are running any this could be your issue too. Normally for Webflow work I run my browser in incognito mode to avoid issues. If this does not resolve it for you then share your read-only and browser / browser version, OS and OS version.
As Jeff has mentioned, the first thing to try here would be disabling all browser extensions and using an incognito/private window, this will rule out a cache or plugin issue. Also ensure your browser is up to date, as well as your PC/device.
If you continue to experience issues, try using a different browser, or restoring your current browser to its default state.
Failing all of the above, please contact us using the link below and we can look into this further for you.