.
Never, ever, "just take a rifle out of the box & shoot it" ! - The rifle could have production debris inside, and should at least have a preservative oil from the factory - all of which should be cleaned out to both prevent damage and to help with consistant accuracy at whatever level.
BUT, so far, so good.......................
(It would help if we knew how far you're shooting - 25yds, 50yds ? )
Now, adjust the windage - tap (drift) the rear sight about 1/16" towards the left.
FWIW:
Before moving the sight sideways, apply a bit of yellow masking tape to the barrel immediately ahead or behind the sight, and make a pencil mark on the tape even with a convenient part of the sight next to the tape - so you will be able to easily see how much the sight's moved as you tap/drift it.
Baby steps - a little sight movement goes a long way.
DO NOT TAP/DRIFT the sight unless the rifle's held very securely, either by a companion or in a padded vise.
DO NOT USE light "love taps" - use a 12oz or so hammer against a non-marring drift pin ( I use the pivot pin from the hinge of a common household door).
Some penetrating oil, in/under the sight base, might be needed to free the sight up a bit for easier movement.
.