Have you properly measured your IPD?

Stand in front of a mirror and hold a ruler up to your nose, such that the measuring edge runs directly underneath both your pupils.
Close your right eye and look directly at your left eye. Move the ruler such that the “0” mark appears directly underneath the center of your left pupil. Try to keep the ruler still for the next step.
Close your left eye and look directly at your right eye. The mark directly underneath the center of your right pupil is your inter-pupillary distance.