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When you check "Only when build ... is new." in the Scheduler you expect a testrun is started only when new build appears. But it checks timestamp of file creation and it may change. Then tests are run two times on the same build. It would be better to check filename.
From my point of view, file is new or modified when its timestamp is changed. Except detailed diff there is no way how to check modifications of some abstract URL. URL path can be same for different builds (using symbolic links), file size can be also same for different builds but timestamp will be always different. It is problem on the server side. I will not implement particular (and wrong) solutions for each server. :)
Verified.