Admin hey. I mine on your pool to adress in bittrex, its okay? But i don't understand, i have 265 shares in miner, but site shows only 36.3, before was about 46 and zero balance

If this happened just recently, we just got 2 blocks.
Your share count resets after blocks are found.
Your share count will also diminish over time if you leave the pool for an extended period.