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It's possible that piled-up cache in your regular browser caused this unusual behavior. You can clear your current browser’s cache to resolve this.
Go to your account by using a private browser or an incognito window. If it works fine, clear the cache in the one that you're currently using.
Here’s how to go incognito or use a private browser:
Then, follow the steps in the clearing temporary internet files and cache article. You can also proceed by using other browsers if the steps above don’t work.
Check this article for more information: Understand the chart of accounts in QuickBooks. Also, the following article on how to set up and add new accounts: Add an account to your chart of accounts in QuickBooks Online.
Let us know if you still have any questions. The Community is always here to assist. Have a wonderful day!