64 bit counter madness

Since the switch to 64 bit counters i am getting totally weird average values like:

CRITICAL – Average IN: 3.41Tbps (170252.50%), Average OUT: 970.95Gbps (48547.45%) Total RX: 5.81TBytes, Total TX: 1.66TBytes|inUsage=170252.50%;85;98 outUsage=48547.45%;85;98 inBandwidth=3405050072654.40bps outBandwidth=970948946016.00bps inAbsolut=6384549288059 outAbsolut=1820440453052 Bandwidth=2000000000

The old version with 32 bit counters works fine, but of course it loops all the time on my fast interfaces.

Any idea ?

PS: Checked system is a Cisco Catalyst 4510 and several 2960