Are you seeing your 1 order split out into multiple orders with a dash "-1, -2 or -3" after the order number?
This is due to the fact you have "order splitting" set up in the admin section of NuORDER. If "ORDER SPLITTING is set up, then your orders can split by different rules such as "ship start date, ship end end, warehouses, department, or season, etc".
If you are a sales rep or sales manager user, then you will have to reach out to your ADMIN user to make any updates to your order splitting rules. Only the ADMIN user will have the permission to make updates on the "ORDER SPLITTING" settings.