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Reproducible on trunk only, 1.18 is ok. Steps to reproduce:
1. Open Special:ListUsers/sysop: http://en.wikipedia.beta.wmflabs.org/wiki/Special:ListUsers/sysop
2. Select another group from the dropdown, submit the form.

Expected result: The members of the new group are shown.
Actual result: The URL becomes something like
http://en.wikipedia.beta.wmflabs.org/w/index.php?title=Special%3AListUsers%2Fsysop&username=&group=bureaucrat&limit=50
and the /sysop overrides the &group=bureaucrat

Good catch.

Appears to be caused by r97658

r110836