The oids in the "Cisco-pix" group in the cisco.xml data collection file are incorrect.

the file has
<mibObj oid=".1.3.6.1.4.1.9.9.147.1.2.2.1.1.4.1550" instance="3" alias="cfwBuff1550BBmax" type="gauge"/>
<mibObj oid=".1.3.6.1.4.1.9.9.147.1.2.2.1.1.4.1550" instance="5" alias="cfwBuff1550BBcurr" type="gauge"/>
<mibObj oid=".1.3.6.1.4.1.9.9.147.1.2.2.1.1.4.1550" instance="8" alias="cfwBuff1550BBmin" type="gauge"/>

Instance "5" and instance "8" should be reversed.

Reference from the site
https://community.cisco.com/t5/security-documents/snmp-mibs-and-traps-on-the-asa-additional-information/ta-p/3116514

cfwBufferStatInformation.1550.3 :maximum number of allocated 1550 byte blocks
cfwBufferStatInformation.1550.5 :fewest 1550 byte blocks available since system startup
cfwBufferStatInformation.1550.8 :current number of available 1550 byte blocks

And also from customer on ticket 5848;
"Please update the cisco-pix data collection group to the correct instance of the OID polled. The minimum and current are flipped. /opt/opennms/etc/datacollection/cisco.xml ... - - + + - - + + - - + + - - + + ... Example: SNMPv2-SMI::enterprises.9.9.147.1.2.2.1.1.4.1550.3 = Gauge32: 36374 SNMPv2-SMI::enterprises.9.9.147.1.2.2.1.1.4.1550.5 = Gauge32: 25273 SNMPv2-SMI::enterprises.9.9.147.1.2.2.1.1.4.1550.8 = Gauge32: 36321 SNMPv2-SMI::enterprises.9.9.147.1.2.2.1.1.3.1550.3 = STRING: "maximum number of allocated 1550 byte blocks" SNMPv2-SMI::enterprises.9.9.147.1.2.2.1.1.3.1550.5 = STRING: "fewest 1550 byte blocks available since system startup" SNMPv2-SMI::enterprises.9.9.147.1.2.2.1.1.3.1550.8 = STRING: "current number of available 1550 byte blocks""