By default, Nagios has the box to make your acknowledgement of a service or host problem checked. I personally do not like this and prefer to sticky an acknowledgement only if needed instead of every time. In order to disable the automatic checking of this option, you’ll need to do the following:
Edit the main cgi.cfg file
Now, scroll to the bottom of the file and make sure you uncomment ack_no_sticky and change the option from 0 to 1.
You can also disable Send Notification, if you wish. Once done, you do not need to restart Nagios for this change to take effect.