Changing dating — apparently this is a thing
Radiocarbon dating is getting a new adjustment — something that happens every so often. (The last time was about seven years ago.)
As scientists get more information about past environments, they use that to make sure carbon dating stays in sync. For example, they might learn from tree rings that there was more carbon-14 in 14,253 BCE in the Northern Hemisphere, so they need to adjust for that.
Ah, that sneaky science — always changing and updating when new information becomes available.