Maybe you double clicked the claim button or some glitch on the website happened. You can always look up your rewards on peakmonsters:
https://peakmonsters.com/@ervin-lemark/explorer
Just scroll to the first season reward claiming operation and open it. There you will see your full season reward :D
RE: Casual Steemmonsters Player's Seasonal Report, March 1st 2020 - 40 Chests Missing?!