Thanks for coming back to us, @DNietoCPA.
Usually, this issue persists when you experience a browser issue. Let's perform basic troubleshooting steps. There are times when a browser's cache data becomes full of frequently-accessed pages. This could affect the performance of QuickBooks Online.
To better isolate this, let's access your QuickBooks account using a private window. Here are the keyboard shortcuts.
• For Firefox, press Ctrl + Shift + P.
• For Chrome, press Ctrl + Shift + N.
• For Safari, hold down Command + Shift + N.
Once done, create a check again. If the account number of the expense is in order, let's clear the cache of your browser. This helps remove its stored cache so QuickBooks will function efficiently.
If it didn't work, I'd recommend using different browsers. They'll provide you with the best and most secure experience. For more details, see this article: System Requirements For QBO.
You can check this link about managing your account in QuickBooks Online: Manage default and special accounts in your chart of accounts.
I’ll be here any time if you have other concerns in QuickBooks. Always take care!
