Related MMa.SE thread (seemingly demonstrates another side of the same bug): "Getting consistent Ticks lengths and TickLabels positioning."
I see the same thing (10.2 on windows) Aspect ratio seems to do it:
Hi Sander, With 10.1 on Windows with fresh kernel etc. I don't have this issue. However the layout is different!
Thanks for checking,
I forgot to mention: $Version is: 10.2.0 for Mac OS X x86 (64-bit) (July 7, 2015)
and I'm running Mac OS X Yosemite (fully up to date).