Form Extractor not working beyond 4 pages

I am trying to extract fields from 10 page document using Enterprise trial version.
However any fields beyond 4th page (i.e. fields on page 5 to page 10) are not getting extracted. I have confirmed that API key & endpoint URL I am using is correct. Page matching info is also correct. I must be missing something but not able to find out. Any help will be appreciated.