We're also seeing this on 8.4.7, although the changes are going into effect and the status on the Restart Groups is showing appropriate information for what was changed. Using Chrome and Edge (which is based off Chrome).
Hello there, In my opionio, this would not be the ideal behavior, in which case it would have been identified and fixed by Infoblox. I would suggest opening a Ticket with Infoblox Support to get clarification on the same. Regards.