A couple things could be happening here.
- You ordered big and small items: For smaller items we use USPS and the larger items we use UPS. So if you got your UPS delivery, the USPS delivery is either on the way or sitting in your mailbox.
- You ordered big items: Your order was split into multiple packages, but you may have only received one tracking number. If you are checking tracking on UPS.com and scroll towards the bottom you will see a section for "Packages in this Shipment (Total Packages: N)" and you can see the tracking for the other packages and where they are in transit. Your packages may have gotten separated but should be reunited soon.