I am not seeing this issue on a test site. You could be having a problem with a chached script, try clearing our borwser cache. If not that then it’s likely a conflict with another plugin. You’ll need to deactivate other plugins to see if you can figure out where that conflict is.
Could be related: https://support.advancedcustomfields.com/forums/topic/wysiwyg-editors-broken-with-repeater/
