If the SteamBoost is leaving too much water on the floor, you may be holding the trigger down too long. Clean by slowly passing over the surface while pressing the steam trigger to emit steam as needed. You can hold the trigger for continuous steam but be careful not to over wet the floor. Note, the pads are moist when using them out of the container.
Let’s make sure the cap is secure. If the cap isn’t on tight, it could cause the machine to leak. Make sure the cap is in place and tightened. See pictures below for example.