unexpected results using the the cluster command

Hi,

I run the cluster command with the following parameters, “#cluster(column=proceed.dist,name=proceed.names)”,then I got the expected results.
unique 1416 …
0.01 1132 …
0.02 871 …
0.03 719 …
0.04 616 …
0.05 540 …
0.06 478 …
0.07 413 …
0.08 357 …
0.09 305 …
but when I added the cutoff parameter “cutoff” and set at 0.03 or other value, I got the unexpected results.
Fox example, the results when I set the cutoff value at 0.03, on the standard output, I found the message “changed cutoff to 0.0125109”,
and then the results showed like below, I really don’t know why the cutoff value changed by the program automatically!
unique 1416 …
0.01 1132 …

Thanks,

http://www.mothur.org/wiki/Frequently_asked_questions#Why_does_the_cutoff_change_when_I_cluster_with_average_neighbor.3F