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TLV2374: Lost gain in non-inverting stage

Part Number: TLV2374

I have designed a USB oscilloscope.

On the input I have a 1 meg resistor going into the non-inverting input of a unity gain non-inverting stage.

I was expecting to get out what was on the input of the 1 meg resistor but it is down about 50%.

The op amp input current is 1pA so I cant see that affecting my circuit.