Can you check the polled values in database and compare them with values reported from MIB
select cp.OID
, cp.uniquename
, ca.assignmentname
, cs.datetime
, cs.minrate
, cs.avgrate
, cs.maxrate
, cs.total
, cs.rawstatus
, cs.status
from dbo.CustomPollers cp
, dbo.CustomPollerAssignment ca
, dbo.CustomPollerStatistics cs
where cp.uniquename='xupsEnvAmbientTemp'
and cp.custompollerid=ca.custompollerid
and ca.custompollerassignmentid=cs.custompollerassignmentid
order by ca.assignmentname, cs.datetime
