@reiddragon which shows you the importance of grooming your dataset. Likely the training data positives came from one machine, or a set of studies in some time frame and the negatives we largely collected more recently. And the inputs included details of the particular machine the images were captured on, likely with the good intention of controlling for hardware differences.
Anyone who says "just throw it at AI" is blowing smoke. Useful tool, but dependent on competent experiment design.