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How do you slow-cook soup in a multipot without it venting out too much liquid?

I mostly use my multipot as a pressure cooker, but today I used its slow-cooker function to make soup.  The manual says that when using it as a slow cooker, leave the pressure vent open (not closed like for pressure-cooking).  I did that, and it vented most of the liquid in my soup out, leaving me with...not soup.

There are two temperature settings for slow-cooking, high and low.  (The documentation does not say what temperatures these correspond to.)  I haven't tried the experiment of leaving the vent closed yet, because I don't know what trouble that would be inviting.  Pressure-cook times are typically in the range of 30 minutes; I slow-cooked this soup on high for five hours.

How is the slow-cooking function supposed to work on a multipot?  Is it safe to leave the vent closed?  Do I need to only use the low setting and not high?  Should I be looking for a problem with the pot itself?  I don't see anything obviously wrong, but that doesn't mean I'm not missing something.