Hi Steven ,
My dev spent som quality time on your issue.
It is just easier to show you what he said:
“The PO search products was showing all language translations. It shouldn't do that, because the Orders only have the original language, so I've just fixed that (and also prevented an additional possible bug when WPML and WC version<3.5.0 are installed).
The problem with the translations: he says that the translation's stock was not updated. I couldn't reproduce that before fixing the above issue.
Please, ask the user to try to do the same after he's installed the next release.
- ask the user to try now to add to the PO only original language products and to try increasing stock to confirm he has a problem when adding stock from PO.”