This sounds like it's related to this:
support.ipswitch.com/.../wp-20051206-dm03.htm
and this:
www.paessler.com/.../823-why-do-i-see-huge-peaks-or-spikes-in-graphs-for-snmp-sensors
Not sure how to best handle it... besides just allowing us to set a level that 'throws-out' any data that's above it. Or detecting a extremely large discrepancy (+- 1000% from the previous value) and just tossing that data.