In the statistics editor, the modified records are not saved if you don't click on 'OK' button even if you hit the 'SAVE' button.
I did the following to modify a stat:
-> configure -> statistics -> modified a stat -> clicked on 'SAVE' -> clicked on red cross in top right of the window.
result: modified record not saved, and no warning popup that modified records are lost
To make sure the stat is saved I had to click on 'OK':
-> configure -> statistics -> modified a stat -> clicked on 'SAVE' -> clicked on 'OK'.
Maybe a small bug but a bit annoying
