You can find what an SG is here, but for a brief explanation, an SG is where the owner of the SG is the only one who writes the entire story based on the characters created for it. The owner then asks questions to the characters’ creators to help them with writing the story. So the input of the RPer is not RP but only to read along and answer questions about what their character does or how they interact along the way.
Yes, I’ve noticed this too and have been meaning to get this altered, but as tags have been on a standstill for a couple of weeks, I haven’t been able to ask. However, I will do so now, as Deluge will be working on tags today.