This is a quirk that's hard to avoid due to the way which CPUminer handles failover pools. All minera can do is check to see if the pool is up via HTTP - the CPUminer api doesn't report what pool it's currently mining if there are failovers selected so if the pool is up but your'e not connecting because of password - it still shows up in minera.

Hopefully sandor will oneday make the pool handling a little sleeker. I'd also like to be able to see live pool switching without restarting the miner. But that's a limitation of CPUminer, not minera.