La Poképarada con más fotos y likes de la celda no se convirtió en gimnasio y en cambio salió en otra (al parecer la más antigua de la celda)
Staff have said that it is not intended to try to manipulate which pokestop becomes a gym.
We have observed that a pokestop that hosts Showcases will not become a gym, which is often the one with the most photos likes.
Here is a discussion from earlier: From PokeStop to Gym?