Why Czech's hatching progress increases and decreases??!!
On day is is 99% and next day it becomes 95%???!!!
Check the incubator page if you are curious about the progress: https://incubator.duolingo.com/courses/cs/en/status
Yes. And once there, avoid getting distracted by the graph and all the ways of extracting 16 insignificant digits from it. Just pay attention to the numbers shown next to "Complete all words" under the graph. At the moment, they are 2122/2234. I bet both will increase by tomorrow.
It is a well known fact that the estimates on the courses page are inaccurate. Just look in the incubator.