microsoft-authentication-library-for-js: redirectUri getting ignored

I include redirectUri when I invoke msal.js but after logging in on Azure AD B2C login page, user gets redirected to the page he/she came from, instead of the redirectUri I specify. Why is this happening?

Here’s my code

<script>
   var instance = 'https://login.microsoftonline.com/tfp/';
   var tenant = 'myazureadb2ctenant.onmicrosoft.com';
   var signInPolicy = 'B2C_1_SignUp_SignIn';
   var applicationId = 'my-application-id';
   var scopes = ['https://myazureadb2ctenant.onmicrosoft.com/webclient/readaccess'];
   var redirectUri = 'https://example.com/member';
   var authority = `${instance}${tenant}/${signInPolicy}`;

   var clientApplication = new Msal.UserAgentApplication(
       applicationId,
       authority,
       function (errorDescription, token, error, tokenType) {
          // Handle error
       },
       {
            redirectUri: redirectUri
       });

       var mySignInFunction() {
              clientApplication.loginRedirect(scopes);
       };
</script>