Red dot & Holographic sights should never have a parallax issue. Its their greatest strength.
What takes some getting used to is the dot "floating independently of its frame" a normal effect. In use the dot must be on the target, where it is in the frame is not important as its "projected" out to infinity & the frame is at 18" or so. Because of this the dot seems to drift about randomly. Just learn to look through the glass not at the glass.
If you do it just right (with both eyes open) the dot will seem to be "out there in space".