Hi…
When I click on save, then the Waze editor shows on which segments it did saving on, but absolutely no saving has been done at all. No renaming, no segment geometry. Everything reverts to the previous state 
Why does it do that?
There seems to be a server issue at the moment.
See also https://www.waze.com/forum/viewtopic.php?f=8&t=90114
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I’ve found that as well. One work-around is to save your work often, about every 10 - 15 edits. Seems like it handles small chunks of edits better than large ones. The last few days I’ve had to redo quite a few edits due to forgetting to save regularly!