For the past week or two there have been very odd edit consistency problems that are difficult to debug and difficult to reproduce accurately. In sum, though, they make editing templates and forms (and sometimes just normal articles) extremely challenging to do correctly.

I've observed all of the following behavior in the past few weeks:
* Make an edit, it "sticks" (no session loss warning), but the page I'm taken to after editing doesn't show the edit. Refreshing the browser multiple times is sometimes necessary, and sometimes only a hard refresh (Edit > Refresh) will fix it.
* Edits to templates don't show up on pages that use those templates for minutes, even after hard-refreshing the pages that use them
* Changes that have been made, and show up when viewing the page, not appearing in the changelog
* Changes in the changelog being out of order with times that are incorrect, even though the final state of the page is correct. In one case I made an edit, then a few seconds later made a second edit. Minutes later, the changelog was showing that the second edit was made more than four minutes before the first!

This problem happens often. A recent page where oddities were observed: http://docs.webplatform.org/wiki/Template:API_Object_Property

It seems like various backends are seeing an inconsistent picture of the status of the database.