This just might be a problem that you come to accept... The hydraulic couplers on my tractors don't leak or seep when under use. They consistently leak with temperature changes; i.e. when it's cold and the metal surfaces contract - I'll have drips in the shed under nearly every group of connectors.
With all 3 machines from 325 hours to 1,500 hours. No matter. And they dripped when brand new...
Of course, I don't park on the concrete driveway in front of the house, either!
Regards.