Is your fighter/rogue human or half elf? If not, you are taking the 20% hit on xp for the difference between your class levels. Only humans and 1/2 elves are immune to this, as they have no "favored class". Note that if you take the races favored class, or keep the levels within 1 of eachother, there is no penalty.
Disclaimer: That only applies if you take it from level one, otherwise, you will still take the hit for the differential between the existing classes.
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