Question : Scope, 192.168.1.0, is 100 percent full with only 0 IP addresses remaining

How can this be if there is only 1 address leased out. We have two DHCP servers running (old server and new server) and the scope on the old server only shows 1 address leased out. There is a Blue exclamation point icon over the scope and domain name.  Our company has 30+ workstations but all of the addresses for those are on the new server except the one mentioned above. What is going on?

Is it OK to run two DHCP servers? Should I deactivate the old dhcp server? If I do deactivate it, are there certain procedures, cautions, etc. in doing so?

Address Pool (old server):
192.168.1.130 - 192.168.1.199 < Address range for distribution

Scope 192.168.1.0 Statistics:
Total addresses: 1
In Use: 1 (100%)
Available: 0(0%)

Answer : Scope, 192.168.1.0, is 100 percent full with only 0 IP addresses remaining

Yeah, you can do that.

Or you could do it like that:

Old
192.168.1.130 - 192.168.1.155 < IP Addresses excluded from distribution
192.168.1.130 - 192.168.1.199 < Address range for distribution

Address Pool (New Server)
192.168.1.156 - 192.168.1.199 < IP Addresses excluded from distribution
192.168.1.130 - 192.168.1.199 < Address range for distribution

By the way, there is no conflict. You have the scopes mutually excluded. That's why your old one has only 1 IP!
You have the scope .130-199, but you excluded .130-.198, leaving only .199

And another comment: Conflicts are not even that big of deal. The DHCP server will first ping an IP - if it responds it will not assign it (default setting at least). You should still try to avoid it, of course, it's still pretty bad.