Colombains aren't Mexicans, nor Peruvians, nor Guatemalans and so on. Therefore Colombians aren't necessarily brown or have similar looks as their Latin American counterparts. In fact, there are a lot more white genes in the Colombian heritage since the Spaniards first arrived in South America. Many Colombians get this a lot:
British guy: But you don't look Colombian, you look white!
This a perfect example of the misconception among people when generalizing typical Latino traits.