Why my coin count has suddenly dropped to 10,827

On Sunday June 30 2024 at 6:21pm I took a photo which clearly demonstrating that I had a total of 12,435 coins. Later on I continue doing more step exercises but this time when I checked the app again I noticed my coin count went down to 10,827. No I did not buy any gift card today or yesterday. Please someone explain to me what's going on. This is not the first time this has happened to me.

-jilspark@gmail.com