I have been using ACF on my clients site for a while and recently I noticed one of the custom post types is showing all the fields I have for the site, it’s showing each field group with a loading animation inside it (I’ll attach a screenshot of what it looks like).
I have tried downgrading the plugins and going to version 5.0.0 fixes the problem, but causes all my posts/pages to hang when updating, so this isn’t really a viable fix (I also would like to stay on the latest version!)
I have search if other have this issue and couldn’t find anything so last resort came here to try get it fixed as it’s quite an ugly problem, sorry if it’s something I’m doing wrong!
This is weird. Could you please try to reproduce the issue on one of the WordPress’ stock themes (like Twenty Fifteen) with other plugins deactivated? If it disappears, then you can activate the theme and plugins one by one to see which one causes the issue. You can also check the JS Console for any error messages.