I appreciate you for getting back to us here on this forum, @ekramber.

An item's price must not be changing when modifying the date of the transaction. I'm here to share with you some troubleshooting steps to isolate the issue.

First, I recommend checking out the Audit Trail report to see any possible updates made by other users. Here's how:

1. Open your QuickBooks Desktop file.
2. Select Accountant & Taxes from the Reports tab, then click on Audit Trail.
3. Review the changes made to your transactions or prices.

Second, you can perform the verify and rebuild tool to resolve the most commonly known data issues in your file. For the detailed instructions, you can use this article: Verify and Rebuild Data in QuickBooks Desktop.

Moreover, here's an article you can read more about the different ways you can track customer transactions in QuickBooks Desktop.

Please let me know if you have any other follow-up questions about your items or transactions. I'm always here to help. Keep safe!