In order to keep data from being lost by an accidental (or malicious) click, MusicBrainz doesn't apply every change immediately, and your fixes are some of those "distructive edits" it makes sure people have a chance to cancel. You can see that they were saved by looking at the "Open edits" page in the bar on the right. They'll be applied automatically in six days, but that can be made sooner if three people vote to accept the change without anyone disagreeing -- normally you'd just wait for the edits to be accepted one way or another, but you can always post here if the fix is urgent or if someone's voting "no" and you think they're wrong. Since you've already added the correct relationship via an auto-edit (one that's applied immediately), though, rather than voting for the "Edit relationship" change, I've chosen one of the removals. It will probably get the other two votes it needs soon enough, as more people see this thread.