What version of networker are you using?
I seem to remember it being a problem with one of the versions. You may have to 
upgrade. Also check the logs for that particular group in great detail to 
ascertain if there were any errors or warnings on the group or clients.
Regards 
Andy

> Date: Tue, 28 Feb 2012 06:10:44 -0800
> From: networker-forum AT BACKUPCENTRAL DOT COM
> Subject: [Networker] Group shows as failed in GUI but clients are all 
> successful
> To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
> 
> Anyone ever see this in the GUI? The group shows as failed but when you show 
> the details all of the clients have backed up successfully? Is there a way to 
> force the GUI to show as successful?
> Thanks!
> 
> +----------------------------------------------------------------------
> |This was sent by andrew.j.wendler AT questdiagnostics DOT com via Backup 
> Central.
> |Forward SPAM to abuse AT backupcentral DOT com.
> +----------------------------------------------------------------------
> 
> To sign off this list, send email to listserv AT listserv.temple DOT edu and 
> type "signoff networker" in the body of the email. Please write to 
> networker-request AT listserv.temple DOT edu if you have any problems with 
> this list. You can access the archives at 
> http://listserv.temple.edu/archives/networker.html or
> via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER
                                          
To sign off this list, send email to listserv AT listserv.temple DOT edu and 
type "signoff networker" in the body of the email. Please write to 
networker-request AT listserv.temple DOT edu if you have any problems with this 
list. You can access the archives at 
http://listserv.temple.edu/archives/networker.html or
via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER