Is the length of the slot the same on each plate? It could just be that they changed their marking scale and you happened to get 2 different markings.
As to the camber, many things could affect it. Firstly you'll want to make sure the plates are pushed in until they hit the inner side of the factory camber slots. Then push in your struts on the plate slot.
In a perfect world they'll be even, but BMW put slots on the strut towers so that they could make sure they are even. So a proper alignment is still required.
Also, your camber will look worse if it's not on a level surface.
You may also want to angle your plates like I did (inside and back (ie. towards your stereo)) to gain caster as well. This will give you better dynamic camber, which is great since it causes you to gain camber when you turn (when you need it) without having too much for straight line braking.
I haven't measured the slots yet, plan on doing that here shortly.
The alignment of my slides are different than yours so I expect to get much more caster out of my plates.
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