If a Facebook post is published in different languages (this is not the same as targeted posts, see attachment), Facebook creates a post id for each language. But Supermetrics will only fetch the post id of the original language and ignore the post id of the other languages.
thank you for letting us know. Could you please give email@example.com a temporary edit access to the file and send us a link to it as a reply to this email. Mark the queries that do not show other languages metrics for example by changing the colour of those cells in to red.