Hey there guracine,
I love that you're using QuickBooks Self-Employed to track your income and expenses, and that you've been taking advantage of the awesome reports that come built in to the program.
When you change the category of a receipt or other transaction, the change should reflect within your reports instantly. Sometimes the images and files stored in your browser's cache can cause issues with the way features work in QuickBooks. Try some of the browser troubleshooting steps below. I'm sure that'll have your reports reflecting the correct categories.
I wish you all the best, and hope you have a great day!