Wheatstone bridge offset
Your bridge connection is most likely rotated by 90 degrees. No bridge would ever have this much offset.  If you are sure it is not damaged, first disconnect any circuitry on the output pins and measure again.  Then, check the pinouts and make sure they are properly connected.  Best bet is to try rotating the strain gauge; that is, apply power to SP and SN and measure EP and EN.  Many bridges are only symmetrical in one orientation, and the measure taps are not exactly halfway between power and ground.