Cam, they're the cheap Chinese spread. I certainly agree they "shouldn't" have such behavior, but they do. For $30, I can overlook that for a 300W max supply. Now with a time delay on the startup, I'm good with my cheap supply. I have an HP supply on the other end of the bench, but it doesn't have nearly the capacity of this one, and I'm sure it cost a WHOLE bunch more when it was new. 
There's a whole host of these, very similar design, but different interior layouts. I'm sure if you checked the schematic, they're all basically the same design. Mine is the well known MAISHENG brand. 
