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Merging regions issue

While merging many regions, I'm getting this error for some of them:

12/12/04 17:45:16 FATAL util.Merge: Merge failed
java.io.IOException: Files have same sequenceid: 75533866
at org.apache.hadoop.hbase.regionserver.HRegion.merge(HRegion.java:4080)
at org.apache.hadoop.hbase.util.Merge.merge(Merge.java:291)
at org.apache.hadoop.hbase.util.Merge.mergeTwoRegions(Merge.java:242)
at org.apache.hadoop.hbase.util.Merge.run(Merge.java:111)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.hadoop.hbase.util.Merge.main(Merge.java:387)

Any idea why?