Hi,
As Rseibert has already mentioned, the first one is a static route. It will be seen in the config if you use the command 'get config | i route'. It can be 'deleted' fro mthe WebUI as well.
The second is a geteway route. It was either pushed by DHCP or you have configured a gateway on that interface, something like 'set int ex/y gateway x.x.x.x'. You can verify by 'get config | i gate'.
WAN connectivity would work in either case, given that you have the right IP on the interface and right gateway configured, static route or connected route.