I have to enter two different passwords to log in

I'm using OS X 10.9.5 on an iMac (late 2012) after restoring from a Time Machine backup because I didn't like Yosemite's aesthetic. It might also be worth mentioning that I use FileVault 2.
Anyway, I changed my root password from (let's call them) "p1" to "p2" recently, as in a week or two ago. For the past few days—I confess I don't remember exactly when it started—I've had to go through two separate startup screens to log into my computer. On the first startup screen, I am asked to enter p1. It should be noted that this is the only occasion where I have to remember p1. Then, there is a second login screen. On this one, I have to enter p2.
Can anyone tell me why I have to go through two login screens to use my iMac? Or, for that matter, why I'm still being required to remember p1, despite having changed my master password to p2 well over a week ago?
Thanks in advance for your assistance.

I can confirm that seduc is correct and that this is an issue cause by FileVault 2. I just finished decrypting my HDD, and I am now presented with only one login screen that—more importantly—asks for p2.
After restarting it, I am now re-encrypting my HDD and will update once it finishes.
EDIT: I did not have a chance to try out seduc's advice, as I had already hit the "Turn Off Filevault" button by the time I saw it, but I'm not quite sure that it would have been sufficient anyway, since I would have had to (or so I assume) disable a user as well; namely, my "old" account that still required p1.
Is it perhaps the case that the disk is encrypted according to the password that has been set? There were and are no other users on my computer; much less any users that would be using p1. So I'm wondering if p1 was the 'code' on which HDD encryption was based? Hopefully I'm making at least a little sense here.

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