If you lower a corner to the height you want and then drive it the height should decrease more than it did before the driving. The converse is true. It may be that when you lower the right front it is raising the left rear but the amount you are changing it would be very very little if at all. You can test that by dropping the left front a few lbs. and see if the right rear height increases.

Your X should have been in alignment when you started process.

If you are trying to get it exact you will be at it a long time and the first time you do something that changes the camber it will change ride height. It is very hard to tell it is not level unless you are out more than a half inch and the alinement after will likely will close that gap. If I get mine a little over or under 1/2 inch it is good enough for government work and it looks level to me, though I am cross eyed in one eye.

If you are lowering the height and after driving it is higher, I don't know what that could other than perhaps if you are checking height with engine off the pressure increases when the engine is on.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas