Version mismatch

When I try to edit anything related to or connected to something I just edited, I get a popup saying,

“Version mismatch: Provided 3, server had: 4 of Way 444988412”.

Moreover, when I edit something and it actually does save, it then disappears from the editor, and is not shown on the regular map as “Map Data”.
But strangely enough, the edits still end up rendering on the map.
I do not know how to fix the problem. It happened in multiple places. here is a link to one of them:

There is (or was) a problem with the data replication from the master to the slave databases.
See my answer on