You do know about the scope adjustments? Normally they are 1/4 minute of angle indents (clicks).
That means that one minute of angle subtends roughly 1 inch at 100 yards!
So for a .22 air rifle - your not going to be sighting in at 100 yards, coz it likely hasn't got that range, more like 100ft
This means that 4 clicks right or left (or 4 clicks up or down) at 100 yards will raise or lower, or move left or right 1 inch.
But at only 100feet, 4 clicks will only move the point of impact 1/3rd of an inch (So about 8mm)
In essence at 100 feet every 1/4 indent click moves point of impact 2mm (3/32dnths) of an inch (up or down / east or west).
Not ALL scopes are graduated in 1/4click indents. SOME are marked in 1 MOA increments, so you said that you were 6 inches down and 6 inches to the right but you don't say at what distance?
How MUCH did you move each scope adjustment turret clicks?
If it were me, I'd move the adjustments back until its midway between each extremity on windage and elevation (i.e. zero setting on both turrets).
I would START trying to get a grouping at say 30 feet for a start, (Maybe inside a hallway with a good back stop so there's no effect from wind).
When you can adjust it onto point of aim at 30 feet the extend to 50 or 60 feet and repeat process - getting it dead on line left right but 1 inch high, then lastly do same again at 100feet & it should be pretty close to spot on.
If you follow that trajectory graph for a .22 air rifle, you can see that bullet drop is quite rapid at relatively short distance with an air rifle so you have to be aware that when adjusted for elevation correctly that by sighting n to be dead on height wise at about 8.5 - 9 meters, the air rifle will shoot about 1 inch high at 20 meters and zero again at about 33 meters (100feet).
At 40 meters (120 feet) you'd have to hold over about 2 inches high...
Half the battle sometimes is actually understanding how scope adjustments work and what the ballistic trajectory of the projectile really is!
The effective useable range then of such a pellet gun is about 100 - 120 feet max.
Hope that helps and makes sense.
Cheers