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Why don't sketch the complete circuit? Anyway, the circuit should output 3.1 V, the schematic doesn't show a problem. Use a multimeter to check node voltages against ground: Vcc, V+, non-inverting OP input.V- is connected to ground. VCC is 5V.
If the +INPUT still is floating, then the voltage at this node may be 3.1V as long as a voltmeter is connected, but it may be any other voltage when voltmeter is disconnected.Use a multimeter to check node voltages against ground: