This. Not all robots work with other robots. A robot that scores well with you may not be of any use on another alliance. It's nothing against the team. Their strategy may not work with your strategy.

Another option regarding the OP's post. What I'm thinking is that, like Brandon said, the 1st seed told them if they were doing well by alliance selection time, they'd choose them. If another alliance before the 1st alliance chose them, and they declined, the 1st alliance may think their robot is still broken, and therefore don't invite them to join the alliance because of that. The one team who invited them earlier just ruined the team's chances of alliancing with the #1 alliance, by making it seem as if they are still broken. It could also be that the #1 alliance told them that they know how to fix the problem and will help them during lunch.

All in all, I highly doubt that the team in question purposely lied to you to bring you to a disadvantage.