This happens all of the time, but I'm not sure what the commonality is, if it only does it with this or that or is it an 18 thing.
When I select something to move, it moves at a ratio larger than where I want it. Looking at the screen I want to move an arrowhead 1 inch, I select it, roll to where I want it, the arrowhead has moved 2 inches, an inch further away from my cross hairs. Object snap doesn't help it will still be an inch away.
It even does for N & E, needless to say that's no bueno.
Thanks