...the OPO here just sent me a few forms to sign from the SF-86. I could've sworn I signed them already...
I'm experiencing the same thing--sort of. I submitted my application to the May boards; results have not been released yet; however, I received the same few (3 total) forms from the SF-86 to sign. I too am rather certain I've signed them already. In fact, I feel positive. I'm not sure what to make of it though, considering results haven't been released from the (May) boards, and it seems odd they would go ahead with the background check before results were even released. Also of note, I have never filled out an SF-86 before my OCS application.