Please help problem with SB700 and yongnuo triggers

When I use my yongnuo triggers with my SB700 and D7000 most of the photos come out with half the photo being so dark you can't make anything out.  If I don't use the triggers and use IR with the flash and off camera sb700 they come out fine.  I really wanted to use the triggers for newborn photo shoots though.  Please help.  Here is a example.  Again, if I take the trigger off, and leave the flash right where it is, and use IR it comes out fine.