I am working on a project, and am trying to amplify the voltage across wheatstone bridge. Here is the diagram: 

[![Wheatstone bridge to amplifier](https://i.stack.imgur.com/pgPc1.jpg)](https://i.stack.imgur.com/pgPc1.jpg)

where \$R\_1 = 1,000 \Omega\$

\$R\_3 = 10,000 \Omega\$

and \$R\_2\$ is a potentiometer, set so that the voltage across the bridge is 10 mV

The gain of the amplifier is simply \$R\_3/R\_1 = 10\$, so I expect an output voltage at \$V\_{out}\$ of 1V. 

I do not see 1V out, I see somewhere around 1.5V, and I am certain that whatever the problem is has something to do with the fact that the voltage across my bridge doesn't stay at 10mV when connected to the amplifier. When I connect the bridge to the two leftmost op amps, and check the voltage across the bridge again, it is around 45mV. 

Why is this? I've checked my amplifier circuit with classmates and rebuilt it several times, I can't tell what might be wrong. What might be causing such an issue?