You have to choose a different option for users to climb the ladder. In your case you may want to change it to post count. This will allow them to move from new member to well known member etc.
On the Trophies page, Trophy points is disabled, however, on the User title ladder page, Trophy points is not disabled. It should be disabled on both pages.
Thank you for reporting this issue. It has now been resolved and we are aiming to include it in a future XF release (2.1.1).
Change log:
Display the enableTrophies option on the user-title-ladder page so that the trophy points option can be kept disabled or re-enabled if trophies are being enabled/disabled.