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INA 210 with Buffer Amp

Hey I am using MCP6001 as a simple buffer amplifier (V- connected to the output),

my voltage divider is 10K and 10K, yet i see at the Vref input 1.38 V instead of 1.5V why?

When the INA 210 is removed the voltage is 1.5V as expected, meaning that the voltage drop is subjected to the connection between the buffer amp and INA 210,

why?