profits should never be below litecoin, WTF?, surely a default switch to litecoin should be mandatory if profits of other alt coins drop below litecoin profit?
The coin being mined is a prediction of future profit. There's many factors involved.
Variance and bad luck in general can make this prediction incorrect. Thus profit drops below LTC level.
There's quite a bit of latency between the choice of mining a coin and receiving BTC in the end after finding a block and finally trading it.