Technically, it should be the level of the mage part. For instance, if you have a Rogue 2/Sorcerer 6, the caster level should be 6, not 8. I've never dualed any of my mage types, however, so can't be sure if they are doing that here. And it's difficult to say in any case, since you don't see the rolls to get through spell resistance.
I know they take full character levels for skills. For example, a Fighter 5/Rogue 2 could have 10 in Lockpicking, where a Fighter 7 could only have 3.
Nightowl2
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