As the title says, the next level (22 in the screenshot below) is still locked although I've accomplished the preceding level (21 in the below screenshot) as shown by the below screenshot:
BTW, I'm on the second stage (Rise and Shine) and this is the first time in seeing this problem happen.
- Why doesn't the next level unlock?
- How do I unlock the next level?
Edit: This happened in the next stage too (When Pigs Fly) and all the stages after it.