Go to Billing Manager > Tools > Invoice Styler.

Click on the Invoice Style. If you are having an issue with the main default style, click on it.

Once in the Style, click on Invoicing and check that the copies field says 1.

If not, change it to 1, and then do File Save when you exit to save your change.

Do this for the other styles if you are having issues with those.

Another item to double check, possibly, is Carbon Copy Addresses under the Matter itself. If these are set up in Orion, extra Invoices for the additional addresses will print. This could be a possible reason; however, you would notice this most likely only on a few Client-Matters where Carbon Copy Addresses have been set up in Orion and not necessarily for every Invoice you print.  The setting can be found on the Matter record on the Bill Delivery Tab.