This just happened to me this morning with a load of palisade fencing components when I opened FormZ 8.0.2.
I had used duplication offset, then move and rotate (X & Y) and move again in the Z. Today they are all over the place.
The original palisade fence component was first created in v6.x.x, then opened and re-saved in v8.0.2 before placing.
As you can see here they are in the wrong place, they are supposed to follow the site edge (brownish area).
It's interesting that other components in the file (Trees) are still in their proper places.
It happened to me earlier in the year on another file, I ended up re-placing them and exploding to be sure they wouldn't move again.
If I open the component, it's still in it's right place in relation to the origin.
Edited by Des, 03 July 2015 - 04:25 AM.