Why would this happen?

Mankind has been around for about 3000,000 years. But yet, humans brains have tripled in size in the last 3000 years.

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DeWayfarer · 61-69, M

Don't know where you got your figures. Here is just one of many that all agree yet contradicts your figures. And gives reasons for the increases:

Smithsonian Institution

http://humanorigins.si.edu/human-characteristics/brains