Multiple DHCP Scopes in large address range

I am having an issue trying to set up DHCP on a Windows 2008 R2 server.  We use 192.168.254.* 255.255.255.0 as our network addresses/mask, but I need to set up multiple scopes for assignment of addresses within that range.  This is because there are several groups of devices that have static addresses and I need to exclude those address groups from DHCP assignment.  All the addresses should use the same gateway, subnet mask, etc.

I added the first range without any problems, but if I attempt to add a second range I get an error that it conflicts with an existing range even though the numeric range of the scope does not overlap the other range.

What am I doing wrong?

Any assistance would be appreciated.

Gary