Group moves other object

When I move the group shown. Another group will move with it even though it’s not selected. I tried to ungroup and move and still I get this strange behavior. What have I done?

LEDbit2.3dm.zip (787.9 KB)

Hi James - it looks like objects were copied with History on. Use HistoryPurge on the second set to nuke its History.

-Pascal

that did the trick. I don’t quite understand what happened however. Is there a simple explanation? The other item was also made of a copy and did not behave that way.

Hi James - if History recording is on when you copy objects, edits to the originals changes the copies.

-Pascal

Oh, so the copies will not effect the original the other way round