It's assuming you picked 'Gifted' as a trait which adds one to all stats but drops down the totals on all your skills and gives you less skill points each level.
Considering the retarded 300% max of skills in Fallout 2, that doesn't mean anything, so people typically pick 'Gifted' since the penalties are negligible as long as a character's intelligence is high enough to pad the lessened skill point total.
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