My free standing water dispenser is leaking from the bottom

If the water dispenser only drips while its off the internal leak may be related to thermal expansion (info) and contraction or the small leak may be evaporating off before you see it while the unit is running.

In any case its probably going to get worse.

Still.

I’d say, replace it before it starts to really leak. How old is the unit?

I have had one of these hot water dispensing systems (In-Sinkerator was the last one) for a very long time. I have replaced several of them. From my experience, they last between 7 and 10 years and then start to leak. I think the spitting is a symptom of a failing system. Mine always act up like that just before they need replaced. I have lived in several different places and the first mod I have done to each of them is to add a RO and Instant Hot water system.