Strange blank product listings

Some of the product listings we successfully added previously using Easy Populate Advanced (EPA) have become blank, the details such as pricing, description, quantity, weight have disappeared but the attributes and product pictures remain. This seems to happen randomly and we don't understand why.

When we tried to re-import those product listing using EPA. There was a strange error: "Skipped: Please ensure that the destination path for moving this linked product is valid."

So then we manually update the product listings in admin and that worked fine. Any clue?

You would probably be more likely to get a meaningful reply if you were to post this in the Easy Populate support thread.

Should I re-post there? We are not sure if the issue is related to EPA.