This issue may happen when your trip wasn't uploaded to the server correctly. Here are ways how to fix it:
On Android
Open Geotag Photos Pro on your phone → open Menu → select GeotagPhotos.net under "Services and accounts" → Reupload
Open Geotag Photos Pro on your phone → open Menu → select GeotagPhotos.net under "Services and accounts" → Reupload
On iOS
Open Geotag Photos Pro on your phone and open Settings → select Cloud services → GeotagPhotos.net → select "..." in the top right corner → Reupload
Open Geotag Photos Pro on your phone and open Settings → select Cloud services → GeotagPhotos.net → select "..." in the top right corner → Reupload