Hello Meesh,

Thank you for letting us know about this.

It's an usual behavior with QuickBooks Online to show the items not in order when printing invoices. Please help us report this by reaching out to our phone support. They can escalate this to our engineers for further investigation. You can get our phone number by clicking on Help (?) and clicking on Contact us. 

If you need anything else, please don't hesitate to post them here.