Leaver Buster

My friend l3lacktip and I were picking our characters when his said there was a problem with picking the character. It would not let him pick his choice and then booted us out of the lobby; giving him a 30 minute leaver penalty. This seems to be an internal issue and not something we should be penalized for. I say we because we were in a party and I support him when he plays adc. The specific character was Kasai.