For some reason, my account's invoicing template changed automatically. It changed to my full name instead of what I previously had set as the company name even the logo

Hello, himanshu1410.

The first time you create an invoice, QuickBooks Self-Employed will ask you to enter your business information. If you recently made the changes, it's possible that the system remembered the last information saved.

I have the steps on how you can modify the invoice. Here's how:

1. Go to Invoices on the left panel.
2. Click the Create invoice button.
3. In the Invoice section, click the Edit work info link to change the Name, Email, Website, address.
4. Click Save.
5. Select the Customize button located in the upper-right hand corner and select Design to change the Logo.
6. Hit Save once done.

I'm adding this article for more details: Create an invoice in QuickBooks Self-Employed.

Please feel free to add a comment below if you have any additional questions or other concerns. Take care and stay safe.