IR obstacle sensor outputing 1.8V

here is a link to the sensor:

the sensor is a digital sensor so i expect it to output either a low of ~0V or a high of ~5V out of the “out” pin however, I am instead getting a HIGH voltage of ~1.8V, does anyone have any idea of why that could happen?
I would be thankful for any answers,
a very confused high school student

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