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You have data, that's good. You've isolated the problem to what seems to be the WHERE clause, good. The WHERE clause is simple, good. So, it would seem DATE NOT = :P23_DATE for your query.
Remember -- or note, if you didn't know this -- page items are (always?, mostly) character strings. As Jeff intimates, if DATE is a date, you will get implicit date conversion in your WHERE clause. (BTW, isn't DATE a Reserved Word?) May I suggest trying "DATE = TO_DATE(:P23_DATE,'your date format here')" to make it an explicit conversion?
Also, I recommend running any query you are having a problem with in the APEX SQL Commands window. Then you can immediately see what APEX is returning for your query. It helps my debugging a lot.