i just tried this out...
it's probably to do with the normals
when i tried to bridge two faces together it worked great, but when i revered the normals of one of the faces and bridged things wents all funny.
just reverse the normals for one of the faces
tip: turn off two sided lighting and you'll see which way the normals are facing without having to show them
option is in the view panel Lighting > Two Sided Shading
one side of the face will be black and the other is the default lambert (that is assuming you haven't played with the materials yet).
that's a "Ch" pronounced as a "K"
Computer skills I should have:
Maya, XSI, Photoshop, AfterEffects, Motion, Illustrator, Flash, Swift3D