That was going to be my suggestion, it should be exporting a value that can be used for importing. But it makes a lot more sense now. When exporting something like an image field, they’d want that to be an absolute URL because WPAI will retrieve the image from that URL and insert it into the media library and then put the ID into the ACF field.
The page link field is an odd field. It stores the post ID when the link is to a post, but unlike other ACF field it can contain values that are not IDs when linking to an archive page or a taxonomy/term page. That may be part of the issue with the exported values. It is the only ACF field that I know of that can contain multiple types of values in the database.
