AMZ splitter/buffer also an AM radio? RF interference help needed!

[therecordingart]

I built the 3-way AMZ splitter buffer, and I'm scratching my head because my version is also an AM radio... 

Every other pedal I have is perfectly fine...even the hi-gain ones. Where do I begin? I would think checking my grounds, but there aren't any ground loops.

[blueduck577]

perhaps you could try putting a small cap from the gates of the FETs to ground.