Well, that is NOT how it's working for me. I lead a small group in our church and I have a group in my Contacts app called "Community Group" in which all the folks are listed. When I create a new email to them, I start typing "Community" and by the time I have put in "com" a window pops open with my contacts that start with those letters. I then click on the right one and all of the names populate in the right window. But if you are content with how you are working, great!I think I figured it out.
When I type in a group name, it shows the first name in the group. But that first name is actually a pull-down menu. In the pulldown list, I found the name of the group. When I click on the group name in the pull-down list, it loads into the field as normal.
I'm wondering, however, if you have inadvertently created a group with a name of one of the members of the group and that is why you are seeing what you are.