How did I lose treats in one day?

Hi, Mary. From the Q&A page, you should see an envelope icon next to your name/amt of treats at the top left. If you click on the envelope, it will bring up a page that has options listed such as "overview," "notifications," etc, right under where it should say Mary C.'s Profile. If you click on the option titled "treats," you can see a log of recent activity, including if some of your answers were down-voted, which likely has caused the decrease in your treats.