Adding Negative Value?

I got a residual check this week from the episode of Criminal Minds I worked on awhile back.  The usual categories came up: Foreign, Pay TV, DVD, etc.  But, also, for the first time I noticed a NEGATIVE value on a residuals statement -- under "Internet Rental."

Hmm, does that mean that we actually had to pay some folks to watch it online? Or that people who did watch it were so disgusted that they demanded (and received) refunds?  I'm not sure.  I'm just glad that the plus amounts were greater than the minuses.  I'd hate to have to write out a check for being on the show...