As mentioned in the documentation, did you ensure you have enabled deny conditions for policies? Because the deny condition in policies is disabled by default and must be enabled for use.
From Ambari>Ranger>Configs>Advanced>Custom ranger-admin-site, addranger.servicedef.enableDenyAndExceptionsInPolicies=true.
If the above is already done, could you try to run the SELECT query on the table with your user account and go to Ranger Admin Audit's Access tab, filter with your user name and validate which Policy granted you the access for the operation (You can identify the Policy ID in the audit entry).
Also, would you be able to share a screenshot of the policy which you had created?