I have an architecture of parent and child records such that Top(T) has one or more children records (M), each of which can have one or more children records (L).

I run a saved search paged.  The search record type is M so I can find all L records associated with M's parent T.

I've created a set of test records such that a page size of 5 will ensure some L records end up on separate pages (most T records have three L records associated).

One test case works correctly, adding L records from a page not within the page range.  However, on a particular page, an L record is duplicated and a third L record is lost.  When I run the search such that the results are returned on a single page (by using a pagesize of 1000 say), all three records for that T record are found and there are no duplicates.  Details below if you're interested.