[Zope] strange "in" behavior

Hi all, I have an "in" code fragment like this: <!--#in result size=ROWS start=query_start--> .... <!--#/in--> Now "result" contains 6 rows: If ROWS >=4, I always get all 6 rows on a single page. If ROWS<=3, I get correct number of rows on the first page. However, suppose ROWS=2, I click "Next 2 results" and the second page gives me 4. Any idea? I'm using ZOPE2.0.1 and ZODBCDA3.1b2 on Win98 TIA CS