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25 yard parallax error pellet shift left to right?

Ok guys at the indoor range sighting in a scope I have as a light weight low power solution on my edgun leshiy.
http://www.cabelas.com/product/CABELAS-AR-RIFLE-SCOPE/2339055.uts?slotId=0

I know this is not a true scope but some things happen today with my left to right groupings. So I am on a bench shooting only at 25 yards. 
I shoot straight on target aimed right in front and I am pretty much dead on at 25 yards. 

So notice when I shot the left part of the paper target for the other sight in mark My groupings of pellets were going slight left. 
Then when I shot at the right side of the paper target all my group was a little right of the target talking 1/2 inch.
Seems like if I straighten out with the target they would line back up. So is this some kind of Parallax error ?

Seem pretty repeatable When I aimed left the pellet hit a little left, when I aimed right the pellets hit a little right. 
I am only at 6 power with the above scope. I am on a sand bag as well, felt confident of my aiming because my groups were pretty tight just the alinement was off left to right depending on which side of the paper target i was shooting at. 

any thoughts ?

Jare
 
very easy to check, move around your head so your eye is moving around the axis of the scope to side.
aim at a point on the target and notice the position of the crosshairs. now move your head a bit left-right, up and down. do not move the gun, still aim at the same point.
does the reticle stay on the same point on the target?
if it does not you have to reparallax your scope.

of course at 6x mag the picture is crystal clear, but it does NOT mean it is parallaxed right for that fixed distance. if you push the distance out, i guess it will improve a lot.
90% people are not aware of this.

to get the idea what i am talking about, try it at 10yards, you will be surpriced how much the POI can be off from the POA, it the parallax is not adjusted and head alignement is random/inconsistent.

thats why one should clamp the gun down when testing pellets, and not even look through the scope when shooting for groups. too much influence can skew results completely