Give us the whole recipe including batch size and your process. How big was your boil size and how much, if any, water did you use to top off with?
Original gravity readings can be off if the water you used to top off with hasnt had enough time to homogenize fully with the wort you boiled and you could have just pulled a sample off the top that was mostly your top off water.
Did you take 2 gravity readings 3 days apart? 2 weeks isnt a very long time for a RIS, though I hope it was done by then if you bottled it already.