Perhaps the first measurement results may not seem quite accurate, but after 4-6 measurements within two weeks, the accuracy will increase to 92+%.
If you think that your measurement results still are inaccurate, try to do the next steps:
1) Be sure you do everything like in this video:
2) Try to change the account to another: Settings -> Log out -> Sign in;
3) If you still have the same problem, don't hesitate to get in touch with us via email: firstname.lastname@example.org