Since virtually every question we get in this forum could be described as "How the code is functioning", you need to provide more specific subject lines, so that people who are familiar with PROC NPAR1WAY might be able to help, while those people who have never heard of PROC NPAR1WAY can skip reading your question if desired. By doing this, you make the forums more useful to everyone. We appreciate the help.
Please change the title to "Unexpected output from PROC NPAR1WAY".
XP2_WIL is an expected output from PROC NPAR1WAY when a Wilcoxon test is requested, see https://documentation.sas.com/?docsetId=statug&docsetTarget=statug_npar1way_details32.htm&docsetVersion=14.3&locale=en
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