Incidents are getting created as inactive

Active field's default value was empty.

https://<instance_name>.service-now.com/nav_to.do?uri=sys_dictionary.do?sys_id=a159e1b5db1303006ada1ded0b9619d9

Hence it's taking 'False' when incidents are newly created.

On OOTB, Default value on Active field will be set to "True".

So changing the default value to 'True' should fix the issue.