Manually approve member feature not working

Upon completing the UM registration form, people are being automatically approved instead of requiring admin approval.

Under the UM Form settings, it set to assign role as ‘Subscriber’. And the subscriber user role is set to require admin approval.

When I submit a registration form for the first time, it automatically approves the new user. Subsequent registration forms submitted (from the same computer/internet browser) then work as intended (displays the appropriate message saying approval is pending, and then shows the member as needing approval in the Word Press users dashboard. Clearing the internet browser data once again allows the first registration to be auto-approved, and subsequent registrations to require approval.

I’m completely stumped as to what is causing this problem. Any insight is greatly appreciated.