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You are right, it DOES look Celtic.

That's not really anything to be shocked about. There are a number of common traits shared between Roman and proto-Celtic societies. Not only did both cultures exist in close proximity (and trade) for more than 2,000 years, but Rome later conquered much of the Celtic world, absorbing both its people and their cultural heritage into their own. Rome even had several emperors of Celtic birth and heritage.

The connections actually go even further than that though. Both the Romans and the proto-Celts originated from the same PIE/aryan migrations that populated much of Europe. They diverged quite a bit over the millennia, but both languages and cultures originated from the same root and cultural practices.

By the late Byzantine when this floor was made, Celtic influences could be seen everywhere in Roman design and architecture.