Steps to replicate

1. Ensure you have at least one device for the default organization in OpenWISP
2. Create a subnet 10.0.0.0/16
3. Add a SubnetDivisionRule as follows:
   Label: DEV1
   Type: Device
   Organization: Default
   Size of subnet: 31
   Number of subnet: 1
   Number of IPs: 1
4. Ensure that subnets and IPs are created for the exsiting device
5. Add another SubnetDivisionRule as follows:
   Label: DEV2
   Type: Device
   Organization: Default
   Size of subnet: 29
   Number of subnet: 1
   Number of IPs : 8

Expected Outcome

IPs and Subnets are provisioned for the device according to the DEV2 subnet divison rule.

Actual Outcome

Only IPs and Subnets are created for DEV1

Note: Both the subnet division rules are created for the same subnet