Port Utilization Alert Bug?

I have the following port utilization alert setup for some new Brocade MLX8e (see attached screenshot). However the alerts that I receive make it hard to determine if the speeds are calculated correctly.

For example my r2-sv2 host sends me an alert with the following info:

Alert Please check the bandwidth on the following port.
Entity GigabitEthernet3/20
Conditions ifOutOctets_perc greater 75 (25228082818)
Metrics ifInOctets_perc = 0
ifOutOctets_perc = 25228082818

SNMP Data
IF-MIB::ifDescr.148 = STRING: GigabitEthernet3/20
IF-MIB::ifSpeed.148 = Gauge32: 1000000000
IF-MIB::ifInOctets.148 = Counter32: 54077801
IF-MIB::ifOutOctets.148 = Counter32: 72166831

More SNMP data 5mins later
IF-MIB::ifInOctets.148 = Counter32: 54087717
IF-MIB::ifOutOctets.148 = Counter32: 72186651

I don't know if this is the expected behavior or if I missing something as I am basing my alert off a percentage.