The prompt in the nomination process indicates that you are submitting a Pokestop, but you are actually submitting a Wayspot to Niantic’s Lightship database. Pokemon Go uses Wayspots that are alone in an L17 S2 cell. A good article about how that works is this one:
https://pokemongohub.net/post/article/comprehensive-guide-s2-cells-pokemon-go/
If you want to leave the name of the Wayspot and the gps coordinates, we can check and let you know if that is what has happened with your Wayspot.