Thanks for your prompt response, @sarah_Olathe.

Let me chime in the conversation with my colleague.

Since you have already applied the steps and unchecked the Show markup on billable expense box on the customize sales form, I'd recommend reaching our Care Support team. Unlike here in the Community, they have tools to pull up your account and help you investigate and find fix for the issue.

Here's how to contact them:

1. Go to Help and then click Contact us.
2. Type your query (e.g. 'Markup billable expense') and then select Let's talk.
3. Choose a way to get support(Start a chat or Get a callback).

For the latest Help update, follow these steps:

1. Go to Help.
2. Type 'Talk to a human', and then type your query (e.g. 'Markup billable expense').
3. Click I still need a human and then select Contact us.

Otherwise, you can uncheck the Markup with a default rate of box under Bills and expenses settings so that you can manually edit the price and add it with the markup amount and send customer invoices. This way, the markup price won't be sent to your customers.

Here's how:

1. Go to the Gear icon and then select Account and Settings.
2. Select Expenses.
3. Click the Pencil icon on the Bills and expenses section.
4. Uncheck the Markup with a default rate of box.
5. Click Save.

I'll be adding this video article as your reference in reviewing your billable expenses settings and setting up billable expenses: Enter billable expenses.

Also, you can run the Unbilled Charges report to show your billable expense charges you haven't invoiced yet. Just go to Reports from the left menu. Then, enter Uninvoiced Charges in the Search box to pull up the report. 

Please let us know how it goes after reaching our support there and if you have more questions. The Community is always here to help. More power to your business!