Welcome and thank you for posting here in the Community. I'm here to help share some information about running Profit and Loss (P&L) report in QuickBooks Online (QBO).
The Profit and Loss report/statement is a financial statement that summarizes the revenues, costs and expenses incurred during a specific period. It's possible that some of your employee's expenses don't link to any expense account reason why it didn't show up in the P&L report.
You may need to check each transaction if the account link to it is an expense account.