Custom query result empty on page 2

It’s a custom dynamic page, used only for this specific query result.
The problem was form action=”” being empty. $_GET parameters were sent to the same page i.e. /result-page/?filter-options=800 which is fine but while on page-2, the results were sent to /result-page/page/2/?filter-options=800.

Setting the form action=”/result-page” solved the problem. Thanks.