I’m not the developer and cannot answer about support tickets. All I can say is that I am not seeing this issue on any of the sites I maintain so I can only assume that this is a conflict with either the theme or another plugin. Both of these things can add CSS to the admin that might affect ACF.
This is why I would look at the element and see what CSS is being applied to it and from where. Or I would disable plugins and try another theme to see if that cleared up the issue.
