Illustrator CC 2014 - SVG coordinates keep shifting position

I'm using Illustrator CC 2014 to create a sprite sheet for use on the web. The artboard and icons are 16px wide. My problem is, the positions of the icons seem to shift, and I can't figure out why. The icons should have an X position of 0px but they keep changing back to -0.0007px after I edit the X position. Sometimes the icons themselves change size too; I could click on one and it would be something like 16.03432px wide. Why is this happening?

I thought it might be the reference point, but i have the art board and all elements set to top left and X: 0px.

The problem for me is when I export as an SVG, the image is sometimes a pixel off which messes up my sprite display on the front end.

I have a link to the ai file in question: http://ift.tt/1zyP6Ws