Abaqus simulation changing geometry of part rather than deforming

I am doing a hydroforming analysis and am trying to use abaqus to simulate this process  in-between two limits, I want the simulation to look like the left side but I'm not sure what is happening to the right side in the pictures i have attached. I was wondering if you knew what was going wrong. 


 

Thanks,
Grace

 

Edu Abaqus