I came home to nearly 1 million PND staked. There were only 15k when I left around 10 hours ago. Looking at transactions, it seems a whole bunch of staked coins from 4 days ago suddenly verified at once! But I am looking at transaction history and I don't understand it. All of the "mined" coins are being deposited into the same address I was using on bamboohouse during POW phase. All of the coins from the multi pool are coming on a different address. Does anyone know why the minted coins are coming in under to an address? The other strange thing is that my staked coins far exceeds the total mined in transaction history (including verified and unaccepted ones). How can I have 1 million staked coins when I have only "mined" a total of about 15k? I'm really confused right now.

Could it be counting deposits from the pool as minted coins since it's using the same address?

? Even if that were the case, it is only counting a few of them because the total deposits from that pool are much more than 1 million.
I mean, I'm not really complaining

I just don't understand why.
It appears you are confused with what Spendable, Staked and Unconfirmed means. It appears you have staked around 15k, and not almost a million. This is an excerpt from our PoS FAQ -
Whats the difference between Spendable, Stake and Unconfirmed? Just like PoW block rewards cannot be immediately spent (for blockchain security reasons, they require a certain
number of blocks generated after them, or confirmations, before they become mature and their status goes from
unconfirmed to spendable), the coins in the transaction that was used to create a new PoS block are said to be
at stake: you promise the network not to spend these coins in exchange for the PoS reward. Since Pandacoin
(PND) doesnt allow the creation of new PoW blocks, the
unconfirmed line will remain at zero forever.
On the other hand, coins will remain at stake for 520 blocks after they are used to create a PoS block; this means
they wont be
spendable for about 8 hours.
If you are uncomfortable about being unable to spend all the coins in your wallet, it is possible to set the reserve
option in the wallet to ensure that the spendable amount always stays above the threshold you configured.
To find out more about PoS and how Pandacoin (PND) staking works, please have a look at our PoS FAQ -
http://thepandacoin.org/doc/pos_faq.pdf