Wrong request count of jmx

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Hi, all

We are using HBase 0.98.6, and we visit the following site:

   localhost:60030/jmx?qry=Hadoop:service=HBase,name=RegionServer,sub=Server

get the following output
    "totalRequestCount" : 64637261,
    "readRequestCount" : 65021869,
    "writeRequestCount" : 45971121,
Why  totalRequestCount != readRequestCount + writeRequestCount ?
Is it a bug? 

Any idea will be appreciated!