no access to saved passwords on mobile

Hi. when i go into passwords, I am asked to unlock to view passwords, it says enter your device pin, I do this and it comes up again "unlock to view passwords" behind this message will be the first page of the password list, if you type in password again as requested it just locks up and you cant get off the page. I am using correct password it unlocks everything else. Please help all my passwords are unaccesable on the mobile, still ok on laptop, I have tried uninstalling firefox and re installing and rebooting mobile, no change. Thanks