Hi @Cheryl_E
Thank you for adding more details about the issue when running the report. I can help you figure out why your sales income from October is missing in the Profit and Loss.
There are two methods you can choose when you run financial reports. You can either select Cash or Accrual for reporting income expenses.
Please make sure to select the correct option to ensure your data will reflect. You can check out this link if you need more information about the difference between the two: Choose between cash and accrual accounting methods in QuickBooks Online.
Also, I suggest setting up the report to show all transactions by choosing the All dates option (see screenshot below). This process will help you isolate and fix the issue on your end.

If the problem persists, please proceed with contacting our QuickBooks Support Team. They can check this issue further to ensure your data will be available for year-end.
Our support for Plus, Essentials, Simple Start is available from 6 AM - 6 PM PT (Monday - Friday) and 6 AM - 3 PM PT (Saturday). For Advanced, any time, any day.
Here's how you can reach them:
- Click the Help tab in the upper-right corner.
- Go to the Assistant tab.
- Click Get help from a human.
- Choose Chat with us or Have us call you.

You can also check this article for more details about personalizing reports, like how you can show all income accounts by changing the filter in QuickBooks: Customize reports in QuickBooks Online.
I'm just a post away if you have any other questions about running reports or managing sales income data. Take care.