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Hi,
After new and clean installation without any modifications I built test groups. When clicking on All Groups the display seems to be broken. I sent a picture as attachment where you may see exactly what Imean.
This is because your template (in this case : Protostar template) :) I saw you add a module on protostar (position-7), if you add module, the protostar template on the main container will be reduce and all of your content inside there will be wrap based on protostar main container size..
I suggest you to search other template that fit with our jomsocial :)