I can see you are running into a problem which can lead to the issues you are having, using the "Test Check Command" button. Due to some issues with how PHP escapes characters the "Test Check Command" does not work in these situations and should be ignored.
So for all further testing of this service you need to:
Make the changes to the service
Save the Service
Apply Configuration
Go back to the home screen and find the Service
When viewing the Service Status Details page click the Schedule a forced immediate check link
Just to re-iterate, for all further testing for this service DO NOT use the "Test Check Command" button, follow the steps above.
As of May 25th, 2018, all communications with Nagios Enterprises and its employees are covered under our new Privacy Policy.