Thanks for your feedback.
I do not see that issue on my demo site. Please make sure that you have the latest version of Meta Box and other MB extensions, you can check the last version on My Account page https://metabox.io/my-account/.
If the issue persists, please try to deactivate all plugins and leave Meta Box, MB extensions activate and switch to a standard theme of WordPress then check the issue again.
Let me know how it goes.