I don't think it's supposed to for anyone but Rangers - although does the figher/rogue have a fighter level yet? If you don't have the armor proficiency for heavy armor then the armor check penalties will apply to BAB AFAIK. Did you use a shield and take the weapon finesse feat by any chance because then I think the shield's armor check penalty goes against your BAB as well.
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There\'s one dwarf left in Moria that still draws breath!
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