Same here, I sent out a recon mission at level 15 because you get a free recon mission at 15, but when it was completed, they said I would have to replace my planet if i wanted to complete the mission. I exited out and went back to the planet section and the recon section said it would unlock at level 20. What is really annoying is that I can't dismiss the two heroes that I sent on the mission, and it says they are still on the recon mission. I am level 20 now and the recon screen doesn't even work.