VUMAT for Ogden hyperelasticity

hi I'm Msc student of mechanical engineering. I work on fatigue behavior of polymer. 
 I wrote vumat for implementation of ogden hyperelastic . my vumat have good result for one element but  for more than 8 elements my model distort excessively. I model a cube and push it with a pressure boundry condition. I set zero the component of 4 5 6 (shear component) of stressNew in my vumat manually but when I run my vumat I see large shear stress in my model.
 does abaqus change stress outside the vumat?
 I use abaqus 6.14-2 fortran2013 and visual studio 2012.