To clarify, which I thought was pretty clear in my OP, but:

I had $61.20 that was expiring.
I redeemed $50. That should leave $11.20 left to expire.

However, afterwards I still had $31.20 still expiring. THey used up "money" that wasn't suppose to expire until the next year first, leaving me with an extra $20 that I still have to burn...this doesn't seem to be fair at all....I don't know about all of you, but I drink the older milk first before it goes bad, rather than starting with the freshest carton....