5+2 and clear blue still says 2-3 weeks??

Has anyone had this happen?? I had my levels checked on 5/12 at 158 and at 5/16 at 899. So they were doubling every 38 hours. But now they should be somewhere between 3,596 and 7,192. That's what I've calculated per the 38 hour doubling rate. So does clear blue 3+ measure at 2,000 or 20,000? Cause if it's 2,000 then my numbers aren't doubling anymore.