Views displays several instances of each group when aggregation is turned on.

I have a view that displays a listing of all the groups (Organic Groups) on my site. For each group, it displays a picture, the title, a short description, the language, and the category in a hierarchical fashion. (last two from taxonomy.)

Now I want to add the number of group members, for each group, in the list display.

I have first overcome an issue of bad syntax when turning aggregation on (fixed by removing the group picture field, then turning aggregation on and putting the group picture field back on.)

Now that I have aggregation turned on, before doing anything with it, the view displays several instances of the same groups.

How do I fix this? I only need one instance for each group. Note that all goes back to normal if I remove the category field ( from taxonomy.)

I hesitate between putting this post as a support request or a bug report. It seems that it's a bug though as simply turning aggregation on should not change anything in the view. I could be wrong though, in which case I apologize.

I should add that my view is set up to display Organic Groups.

Any and all help with this would be greatly appreciated. Thanks. :)