Open Stack

Hi,
I am using devstack for the first time and I see that it has created a
subnet like below. The cidr and gateway do not match. Because of this
devstack fails to run completely and fails while attaching a router to this
subnet. Why is devstack doing this??

stack at controller:~/devstack$ neutron subnet-show
b5b7c8a2-3413-40a8-8bf5-a9337eb885d8
+-------------------+------------------------------------------------+
| Field             | Value                                          |
+-------------------+------------------------------------------------+
| allocation_pools  | {"start": "10.4.128.1", "end": "10.4.143.254"} |
| *cidr              | 10.4.128.0/20
<http://10.4.128.0/20>                                  |*
| created_at        | 2016-08-21T11:38:57                            |
| description       |                                                |
| dns_nameservers   |                                                |
| enable_dhcp       | True                                           |
*| gateway_ip        | 10.0.0.1     *                                  |
| host_routes       |                                                |
| id                | b5b7c8a2-3413-40a8-8bf5-a9337eb885d8           |
| ip_version        | 4                                              |
| ipv6_address_mode |                                                |
| ipv6_ra_mode      |                                                |
| name              | private-subnet                                 |
| network_id        | 8f06d528-c8e0-40a2-906e-0c77bfa169d9           |
| revision          | 2                                              |
| service_types     |                                                |
| subnetpool_id     |                                                |
| tenant_id         | 55c9410dfdff4e4a84cf685d3d578ecc               |
| updated_at        | 2016-08-21T11:38:57                            |
+-------------------+------------------------------------------------+

Thank you,
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