"There isn't enough information to tell what is happening. My bet is contamination of the samples."
This is exactly what makes dating, carbon dating in particular, so unscientific; at least in the way it's being used by evolutionists. If the date doesn't make sense with what they believe, it gets thrown out. There are actually many quotes from scientists, evolutionary advocates, that state that dates that do not make sense, are simply discarded as irregularities. However, there have been some figures that state that as many as half of the dates found using the C14 method are thrown out. How do you know that the other half is correct? The reason that these dates are kept is because it backs what they already believe.
Science has to back a theory for it to remain valid. It is certainly not the other way around.