I noticed this too just recently. And since I’ve been running Stacks 3 for about a year – I’m going to make a wild guess that it’s not Stacks 3 (to be perfectly honest I don’t know that for a fact).
But I did notice there is a new settings was added to RW about the time this behavior cropped up. I posted about this coincidence here:
P.S. I’ve also submitted this bug to the folks at RMS – but it’s the weekend and as a favor to our friend Nik who had a tough week (https://twitter.com/nikf/status/637361661091934209) – let’s maybe let this one slide until Monday. thx