AIX memory checks

We’re seeing garbage data on some of our AIX (7.1) clients like this:

red Thu Jun 23 15:29:28 EDT 2011 - Memory CRITICAL
  Memory              Used       Total  Percentage
&red Physical    18446744073709551177M       4096M18446744073709551606%
&green Swap                 40M       4096M          0%

The ones that exhibit problems have Active Memory Expansion enabled. Is there anything we can do to get valid data? Should I report it as a bug?

-- 
Rob McBroom
<http://www.skurfer.com/>;