Don't know if any of you have noticed this but my challenges in MapMyRide.com are inaccurate. It appears that the cumulative distances (the basis of my challenges) are correct (this month to date is 292km, year to date is 398km). My current challenges are 500km for the month of April and 4,000km for 2013. The two challenges should read 58.40% and 9.95% but in fact, the site reads 48.48% and 8.41% respectively.
I know that there is at least one February record it doesn't seem to include in the annual challenge (I've tried re-entering it on both the same date and another date but no difference, the challenge doesn't include it although the total does).
Even if none of you can confirm or deny, perhaps the MapMyRide folks will notice this post and have a look at their system.