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Hi there @Yeloperyl and good day to you.
If that was what has been happening after you've cleared cache as mentioned by Mr Cichy, perhaps you may try not to clear cache for a day and log in the game as usual to see whether you are able to collect the reward for the following day.
Let us know if the above tip helps. If it doesn't, then I hope you can get some insights from the the message/thread posted by Crazy Cat Lad on "Daily Treat Calendar stuck at day 1" and shared by Mr Freddy and Mr Rajdeep above.
Thank you☺️