I apologize if I sounded condescending in my response; I merely wanted to be clear in my explanation. I also understand your issue, and I can clearly see that 0.00332835BTC (first picture) is higher than 0.00321634BTC (third picture).
What I'm suggesting is that during the time you spent mining, maybe the exchange rate between BTC and LTC changed, therefore accounting for the price difference. You didn't mention when, nor how long you spent mining to LTC, so you'll have to look at the price histories to figure out if this explains the situation.
Yeah no worries. I did in an earlier message state that I only mined LTC for about 30 seconds, and the whole drop in balance happened over a 20 minute period.
It does seem that there is a conversion happening, and there is a small spread on the price you get for conversion, so you lose a bit of value.
My main concern in that any address, which by all means is a public bit of information, that has an outstanding balance on it can be maliciously manipulated to drop the balance. Not only that, I could even change the currency so the address gets paid out in a currency the owner of the address didn't want, or possibly doesn't even own.
I would like to hear some input from pinpins as to the expected behaviour on this