I am creating a fictional off-solar system colony. In this colony people started to use a duodecimal positional number system. The people were all cultured in science and practical with numbers. They didn't have any sort of amnesia or contact with alien cultures, their new world is similar enough to Earth to allow using the old system, they don't have to hide any technical secrets from each other.
My question is: Why would a group stop using a decimal system and start using a dozenal system?
Could it be because of an event (like a war) that happened before they started the colony (assuming they started using it only once they started the colony)?
Has it already happened in the world? What kind of results could it have in their culture, technical development and science?
Thank you for your answers