P: Problem reordering images manually on MacOS

Lightroom 5 bug in reordering images manually - Mac OS Only.

Symptoms:
In grid view if you drag a photo to change position and try to swap
with the image on immediate left the image you're dragging moves to the last place.

Step to reproduce:
1-Open lightroom
2-select a folder
3-click on one image
4-drag over the immediate left image
5-release click
6-the image moves to the end of the grid

versions affected: 5.0 -> 5.7
OS: Mac OS X only (10.9.x - possibly other versions too)

screen recording: https://dl.dropboxusercontent.com/u/2...