Each person has an individual learning style, and just because math and science tend to go hand in hand, that doesn't mean that people will automatically excel in both subjects.
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Because they are based more on theory than numbers and facts
You can't be good a everything.
Because math, physics, chemistry and computer science are not the same things. Just because you're good at using maths doesn't necessarily mean you're not good at applying them. Theoretical and applied mathematics are widely considered very different fields.
Because of the way the brain works, some people are good at both, and some are good at one but not the other
Given these two characteristics, there are four possibilities: Some people are good at math and have bad writing skills. Some people are good at math and have good writing skills. Some people are bad at math and have good writing skills. Some people are bad at math and have bad writing skills. Leaving aside what it means to be "good" or "bad" at these disciplines, it is likely that these groups of people have varying amounts of genetic predisposition for success at these aptitudes and their environments provided varying amounts of support or resistance to help them fulfill their levels of achievement. If you're suggesting a causal relationship, that to be "good" at one necessarily implies being "bad" at another, I don't think such generalizations are useful.