Hi, Patricia,
Seems there's more to this than what is in your post.
When I do this with the same release as you or the site are using and also with the current shipping (161129) release of PO and with the same filter active, in neither case does the PO disappear from the grid -- not the one being copied nor the one it's being copied to.
I'll do some more looking though.
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Regards,
Softrak Tech Support