Two different brainkeys for same account

[Ac7000]

Hello,

I was backing up my bitshares account and noticed something.

I backed up the brainkey from the browser. Then on my local desktop wallet, there was an update available, so I downloaded the update. After I downloaded it, it said "BACKUP NEEDED", so I backed up the brainkey and again.

To my surprise, the brainkey was different.

Is the local wallet brainkey supposed to be different than the browser wallet brainkey?

I saved them both down just in case, but it is worrying me a little. I can't wait for bitshares to have the option to recover your account if you lose your account info!

Thanks