First, check your radiator, parked for long-time. , if no leaking then..
Second, check your floor carpet especially at driver place. If basah, then confirm the water leaks from the heater (actually, i donno whether CF4 got heater or not cause actually heater is normal for all JDM cars). If still no leaking, then...
Third, actually CF4 radiator tend to 'drink' water or water drying. happanned to me also now, but luckily very2 minimal (like 5% l water dissapeared), not so critical like yours. I've checked mine also recently, no water dripping after long parking, reserve also almost empty..top-up water. But so far no increase in temperature or whatsoever la. Maybe it's drying due to the engine heating.