Failed in less than 30 rounds - Barska 1.5-6x44mm Level Rifle Scope

I bought this scope because i liked the relatively simple reticle, the 30 mm tube, and the fact that it illuminates in green which is easier on my astigmatism than red. I installed it on my rifle, a 6.5 creedmoor, and had a satisfactory group within 12 rounds at 100 yards. Then my wife got a new rifle, also 6.5 creedmoor, and liked the simplicity of the reticle, so I moved it to her rifle. While sighting in yesterday, I became unable to adjust the windage with any kind of accuracy. The last straw was when two clicks of adjustment resulted in 4 inches of movement. This is after maybe 8 rounds. So I've probably got about 1 box of ammo through it. It's a shame, the glass is pretty good, the illumination is nice, and the price was decent.