TL;DR; Copy and paste on a bus entry doesn't work as expected. Copying a bus entry, then trying to paste it back causes the entry to appear in its original position and not on the cursor for pasting.  This ghost copy can't be selected and saving the sheet, then reloading will cause the copy to disappear.  If you copy multiple items and this includes a bus entry then the whole block exhibits this behaviour.  It can be more easily seen if you copy from one sheet to another, but also occurs on a single sheet. Recreated on both the Mac client and web client (running in Mac Chrome) V6.2.43.