MAG3110 output values conversion

Hi I have a MAG3110 triple axis magnetometer, using the sparkfun library to calibrate and print out values for each axis I get values that don't go negative no matter what arrangement I put the sensor in. I read online that the values being put through are signed integers yet I can't seem to find any way to convert the values.

I don't have the code in front of me right now will update when I get back to my computer.
Thanks.