IPAM only scanning some devices

Hi.

IPAM scanning seems to work fine. That means that I can see the ICMP and SNMP traffic in the firewall log. But... only some of the devices / servers get registered as in use / transient in IPAM. Within one subnet abount 1/3 of the servers get registered, and many IP-adresses that are in use get the status of "Available" (but they are not). Even devices (IP-adresses) that are been monitoring just fine by Orion NPM don't get registered by IPAM.

/Arjuna