Why is the Cost of Sales not reflected for one particular month in the Profit

Hello there, @usertimmy.

I'm here to provide some insights about your cost of sale.

Your cost of sales varies on the transaction date of your transaction.

Please make sure to review your transactions for a certain month. 

If you won't still be able to see the transactions in the said report. I'd suggest you reach our Customer Support Team to check your account in a secure way and check why you're not seeing this in your report. Here's how:

1. Select (?) Help.
2. In the QB Assistant enter the topic you need help with. You can also enter questions.
3. Select to connect with a live support agent.
4. Choose a way to connect with us:
   • Start a chat with a support expert. Live chat 24/7 (M-F).
   • Ask the community available 24/7 (M-F) to get help from businesses like yours. you can check our help articles about managing your account in QBO. 

Additionally, you can check our help articles about managing your account in QBO. 

I've also added this article to learn more about customizing QuickBooks Report: Customize reports in QuickBooks Online

If I can be of help while working in QuickBooks, feel free to let me know by adding a comment below. Have a great rest of your day!