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If you find some cells low in a battery generally it does mean there's a problem with the cell. It could be a crack that allows a leak, sulphating causes crud on the bottom of the cell which can conduct current, that can cause the cell to overheat and boil off fluid. It may take a while for the condensing electrolyte to show up dripping out of the vent tube, when the bike is hot from use the air in the cell and tube can hold more water vapor than it can when it cools so it might take a bit of time for the vent to drip.
If you find some cells low in a battery generally it does mean there's a problem with the cell. It could be a crack that allows a leak, sulphating causes crud on the bottom of the cell which can conduct current, that can cause the cell to overheat and boil off fluid. It may take a while for the condensing electrolyte to show up dripping out of the vent tube, when the bike is hot from use the air in the cell and tube can hold more water vapor than it can when it cools so it might take a bit of time for the vent to drip.