Dedupe is seems to be broken to find the dupe with multiple matching fields.

It looks like current dedupe mechanism is getting fail to find the duplicate contacts with the help of multiple matching fields.

Steps to replicate :

1. Configure 'Strict' individual rule as first name = 5, last name = 5 and threshold as 10.
2. Use profile create mode ( civicrm/profile/create?reset=1&gid=4 )
3. Here user could create multiple contacts with same first and last name.