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I don't know what prep you used but if the old floors had any wax buildup or other impurities, that could affect things adversly also.
Exterior paints are softer than interior are too. It's a wear layer to slough off UV rays.
use heat, fans, and ventilation along with patience. If there isa thick layer of floor paint and you dry it too fast, it can skin over and l;eave a softer gel layer in the middle that will always scratch easily.