Well, this is disturbing: my resin 3D prints are melting

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There was nasty gray sludge on the shelf, under a 3D print of a chess rook. It was not the way I wanted to end a long day.

As the video shows, one or more rooks (there are four on the shelf) either began melting or oozing very toxic resin all over my shelf. But why?

I will clearly follow this up, hopefully with better answers. Until then, if you know what caused this mess, please leave comments below. Have you every had your resin prints melt or explode? Let us know.