At various stages of the Captain Marvel movie, Vers is shown to be bleeding, sometimes in a flashback sequence.
Her blood seems to be blue when she thinks that she is a Kree, like Yonn-Rogg, and later red when it is revealed that she was a human (Carol Danvers) all along.
What is going on with Captain Marvel's blood colour? Have her memories been tampered with in the flashback sequences? Is the device attached to Captain Marvel (which she detaches during her final encounter with the Supreme Intelligence) altering her blood colour? Or did she have a transfusion?