Just guessing with your code, It looks like your result is left justified (or right) but in any event, you appear to be reading the the 2 LSB as bit 6,7 of your answer. since the 10 bit result is a word, you seem to have result high as valid 8 bits. but your result low is ddxxxxxx. So your LSB is really = dec128 and not 1!
How do i guess this? if you right shift your 13300 6 times, you get ~207. Assuming you are testing 0-5V you expect 1024/5=204 per volt. Pretty close.
If you need help understanding or fixing this, post code!
Sorry, we posted together
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