Welcome to the Candy Crush Saga Community
Do you have a question or need help with your game? Ask the Community.
You are probably playing the game on the Facebook platform through the browser.
You save the Facebook login to browser then bookmark the page. When you open the game with bookmark, the Treat calendar will work properly.
Playing games through the browser is an online platform so we can't say for sure if your treat calendar will always work properly.
For lives issue please check HERE.