Fog machine spit out HOT juice.

I wasn't exactly sure where to post this, so excuse me.
Last night I was running my projector and fog machine like most weekends.
Well after an hour ish of use I was standing just a little forward of underneath it when it spit out a drop of burning fog juice. It hit the back of my neck and made a penny sized burn. Like instant blister and will get a decent scab from it
I do notice every now and then when the fog shuts off it will give off a tiny after spray puff. so did it just puff out raw hot juice? I also have the fog machine positioned slightly upward.
I do not want this to happen again for it could land somewhere worse like the face or eye. Is there something I am missing that I should or should not be doing.
This is my first fog machine too. The one in my sig