Hello there, accounting1203. Did you happen to have any transactions created yesterday between 8:45–11:15 AM PT?
If you did, we're aware of the situation, and our engineers are working to restore full functionality as soon as possible. In the meantime, you'll want to log out and back in or try a different browser to fix incorrect amounts. Then, you'll also need to open and re-save them to update the tax amounts.
If the issue persists, please reach out to our QuickBooks Online Live Support team for immediate assistance.