Torch showing Source addresses that are not in router

I have a subnet of arin IPs that are routed to me but are not in use and not in my router yet. When I use torch I see many of these IP’s showing up as the source address with an outside IP as the destination.

How is this possible if I do not have these IP’s in the router yet?

The traffic is probably scans of that range being routed to you then your router is sending back to the default gateway which possibly sends it straight back to you giving you a confusing image of the traffic.