I’ve seen a few times that building a complex flow chart, selecting some or all of it, moving it and then hitting ctrl-z to undo the move can sometimes lead to the arrows or other elements ending up in weird places.
More recently, I started a mock up / wireframe. I added a plain blank frame element, and over that (not grouped, just on top) a table. To that table I added some rows and columns and the beginnings of some data. Then I deleted the wrong column (still unclear how to control which column gets deleted; you may want to make that a separate ticket), and when I went to undo the deletion, the data were all sprayed all over the place throughout the table.