Sp2 CP engine: the "at least one of the conditions" works only from time to time - does not look like working with pid -does not give the same result after adding and removing conditions

I am trying to use the "at least one of these conditions" criteria in the CP search engine.

There is one page (pid 184 created by root) with the work "intellogix" that I am looking for (screen1).

Then I add a new criteria (author = root) and this list this page and all pages that root created (would be interesting to list by pertinence and to first list results that match both or all criterias and only then results that list only one of the criterias) - screen2

Then I add a new criteria (ID = 180) and .... no result any more! However the search should match at least one of the criteria (and not all criterias), so why such a behaviour? (screen 3)

Finally I modify the pid criteria and convert it into another new "author" criteria still with the root user. If I launch the search queries, I have then no result any more. This also work if you only add a new fresh criteria to
query (ex: author - cf screen 2), convert it into a pid criteria, make your search, then reconvert it back to author, relaunch the search query... and no more results! So looks like criterias modifications are not effective! (screen 4)