Reality Check: Planet with low gravity and water vapour

Using Artefaxian's excellent spreadsheet I have created a basic idea for my planet, but in the 'Stability Checker' part my low gravity planet is unable to hold H₂O.

I am wondering if it is possible to have a planet with low gravity and water vapour.

Mars apparently still has water vapour so I think it must be more than just escape velocity affecting the composition of the atmosphere.

EDIT: I'm wanting a planet with low gravity and oceans, rivers and lakes. Is this feasible or is it only possible to have traces of water on a planet with low gravity?

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Reality Check: Planet with low gravity and water vapour

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