I replicated the issue, as I mentioned the zoom view is apparently being sorted, and saves it's sort setting. Notice to leave the zoom you have that yellow bar "Click to zoom-out"... but if you barely miss that and hit right below it, "*All tasks > >" then it will instantly sort the task names in alphabetical order. His image shows it is reverse-alphabetical order, which happens if I make that same mistake a second time.
To restore it I was either able to click "Discard changes" which would be a button at bottom of the filter stuff on the left, or I can click the "Sort" button above there and change where it says "Caption" to "(none)"