Hola Mia

When this happens the most likely answer is that we added new lessons to that level. We did indeed add a good number of new lessons at all levels very recently!

Check out this FAQ about scoring: Why did my level score go down?

If after reading it, and checking all the possible reasons and solutions for bringing your score back up you feel that it must be something else, please get in touch so we can investigate.

Saludos

Shui