You are saying it does work for you to download a PQ in Cachly and have it show the corrected coordinates indicator?
When doesn't it work? If you are meaning with a PQ GPX file then this is correct. The GPX files make no indication that they have corrected coordinates, so Cachly has no way of knowing this. I would avoid using the GPX files and download PQs directly in Cachly since it uses the API and will know there are corrected coords.