I had the same questions, but everyone told me they will come to you. You just have to wait.  The coins you are auto exchanging are going to the exchanges like "Bittrex" or "Cryptopia". So they are not on MPH at the moment until they are exchanged back. Now the coins do fluctuate and also Etherium, Litecoin. Bitcoin fluctuates as well. So, this means it might take some time for your coin to be exchanged to your desired coin.
All this being said you also have to wait for your coin to find a block on MPH.

Coins are removed from wallet with a Debit_AE (Debit for Auto Exchange) transaction and will appear in the destination wallet with an ordinary Credit transaction. These transactions can be viewed on the wallet page for each coin.

However there can be significant delays between the debit and the credit. Delays can happen because
1) The miningpoolhub accumulates coins so that they can be efficiently converted at the exchange, and there are minimum amounts for conversion. This delay partially depends on the amount of work miningpoolhub miners put into this specific coin.
2) The block confirmation times (which can be very long on some coins) delay the exchange at various points along the way.
Therefore 4 ~ 6 hours of delays (even delays measured in days for some coins) are possible.

Coins that don't satisfy minimum trade amount for certain period of time would not be auto exchanged to desired coin. These coins may be sent back as original coin and amount, or as exchanged Bitcoin.

Additional 0.2% Fee is applied. (Txfee for sending from Mining Pool Hub to exchange site is included in this fee)

Hope this helps