Gallery addon image creation

When I add images to a gallery the system is creating 5 images when I was only expecting 3.

Here's my image.html

<perch:gallery id="image" type="image" key="main"  width="1280" height="720" />
<perch:gallery id="image" type="image" key="thumb" width="200" height="200" crop="true" />

And I end up with:

photo.jpg (expected)
photo-w1280h720.jpg (expected)
photo-w200h200.jpg (expected)
photo-w180@2x.jpg (not expected)
photo-w150h150@2x.jpg (not expected)

How are those @2x images getting in there?