Loss on swap price for Hex, compared to market

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I made 2 swaps at the same time HEX for USDT: One swap yielded me a token price of .059. which is what the market price was, the second swap yielded me .044. since i swapped the since I was swapping the same number of Hex, why would i get dinged with a loss of 25%. MM reports the daily low at 51. I guess some days you get screwed by the system. Lesson learned. I will do my own unit calculation of the swap, then compare it to market before proceeding to execute each swap.