Copying items to a model set - parts lose position/orientation

[theAVator]

I have several groupings of parts that I need to essentially combine in order to work with them for what I really need. Each grouping is in it's own model set (due to having to pick them out of a larger grouping). When I select the parts in a group and choose "copy to model set", when the parts arrive in the selected model set some or all of the parts lose their position and orientations.

Anyone know why or how I can keep the positions correct?

KS 7.3.40 Enterprise
Win 10 Enterprise