Sometimes it's very confusing how Sharepoint 2010 group creation works

Here's a scenario we have been facing from a long time wrt groups in SharePoint 2010

We had requirement of creating a two custom groups followed by creating a custom site through programmatically, For the most case the scenario works as how it is excepted to work.

but, out of 1/100 site creation process the groups creation fails, which means we were able to access the group and users associated with it through programmatically. but, when it comes to UI stand point if you try to access the specific group page from the site permissions page - SharePoint returns a BLANK WHITE Page... BLANK WHITE Page... nothing else...

Ain't is this a Sharepoint 2010 issue. or anybody had this problem and fixed it. Kindly share your thoughts