Why can't I see some of the funds that I am eligible for in the funding section?

Here's some more information on the funding section and how funds are presented.

Some funds may require an opt-in or additional questions, these are the ones that you can view in your applicant portal.

The reason you are unable to see some funds is because they does not require and opt-in or additional questions. If you meet the eligibility criteria for a fund and submit your application with references included before the funding deadline, you will be automatically considered. 

The additional questions criteria can be viewed on a fund's page via the funding search: Search - Postgraduate Funding Search (cam.ac.uk) I hope this helps.