After Resetting Preferences guides do not match rulers

After reseting preferences, my guides (guidelines) no longer seem to match the ruler.

I create a new 2048x2048 document. The ruler appears to show the upper left corner as 0,0 .... But when I drag/snap a guide to the left side, it shows 24px.

In the past, I could get a guide to auto-snap to the center a document (in this case, it would snap to 1024). 

Now it snaps to a different place, AND AND AND the display of the location varies depending on whether you are dragging from the left_to_the_right vs the left_to_the_right.  
How can rulers that stop in the spot on the canvas be displaying different numbers for the pixels?
See the video for example.