Puzzling result from opamp circuit. Using opamp for negative reference
There is no dot closing the feedback loop on U$4G$1, so you think you have connected something that isn't connected.  Eagle puts dots at every junction, and one is missing here.  Go into eagle, and move around some nets to convince yourself this is true.  Use a wire to connect pins 1 and 2 to close the feedback loop.  I bet you'll see that the inverting input and the output are on different nets.  Use the eyeball tool is the schematic to look at traces on the board as another easy way to check.

There may also be an issue with OUTS on the gate in the upper left corner.