I can see what is causing the offset but I do not know if it is accidental or is on purpose - the seeedstudio people will need to answer that question.
What is happening is that in the seed_gerber cam file all the layers except the drillholes have the style options “pos. cood” and “optimise” ticked. If you tick these two options then re run the cam job the holes will now line up whenyou reload the new files into the gerber viewer (I use the free viewmate version and eagle 5.11 lite).
We will find out in a couple of weeks when thay are back at work,