Greatest Hits
The Best of Leonard Cohen / Greatest Hits
From the wording on Wikipedia it seems the second release group is correct and the first group should be merged in there. I am not sure how to do that.
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If you go to the first release group page, click ‘merge’ on the bottom right, and then navigate to the second release group page, and click merge again, you will be taken to a new screen where you can choose what to merge into what.
Found some discussion here: https://musicbrainz.org/edit/70851342
Looks like there’s a third release group that can probably be merged as well 
Note that it might be worth having a look through and making sure all the releases really do have the same (more or less) tracklist… I haven’t checked.