random "coming from"?

So when I use the Uber app,and select Ride, at the very top, one enters a "Where from?" But instead of having a blank field, this field oddly defaults to an address that is close to my home address, but NOT my home address. When I click on it, I'm offered a selection of random addresses within a block or two of my home address. Duuuh? At that point, I can erase the default and enter whatever I want, but why in the world does offer me a bunch of (local, but pretty irrelevant) random addresses?