Yuuhei Satellite & associated crew release a ton of "extra" albums at events, small samplers containing just a couple of songs. Most of the recent ones are branded with more than one circle: generally either Yuuhei Satellite and Shoujo Fractal, or Yuuhei Satellite and Shoujo Fractal and Yuuhei Katharsis.
On the circles' group website, each discography entry is also tagged with which circles the album belongs to. These extra albums have the Yuuhei Katharsis logo on the front, but aren't categorized on the site as Yuuhei Katharsis:
This tracks with the contents of each of those albums, as Yuuhei Katharsis is the "non-Touhou" circle and all of those albums are entirely Touhou arrangements & image songs.