Glitch found!

[ilovescience]

Today after I did my French Basics 2 lesson 3, instead of the streak adding up it subtracted 10. Did anyone else experience this?

[jrikhal]

I read about the same glitch several times in the past 2 weeks.
But it was always solved after earning some more XP points: all the "lost" XP points by the glitch reappeared when earning some new ones.

[SmokeyIX]

I'd like a 10 point glitch. Sharing on facebook is so hit and miss, it hasn't shared on mine since level 20. I'd like to dial 10 points back to level 22 a few times until I luck up and it updates.