The function returns the high byte and the low byte on the two calls. The integer is constructed by shifting the high byte 8 places to the left and adding the low byte, as was shown in reply #11. It is NOT constructed by simply adding the two bytes.
The values that you are getting are 1 and 67. Shifting the 1 8 places is equivalent to multiplying by 256. So, 256 + 67 = ? That's right. 323.