I've never had this happen before. Same procedure and wax and addatives I've always used only this time it looks like the pillar got smacked with a baseball bat.
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"A wise man can see more from the bottom of a well than a fool can from the top of a mountain top."
Oh my, something very similar happened to one of my pillars except it was much worse. I was experimenting adding palm and parrafin together and when it came out of the mold it looked just like someone had like you said smacked it with a baseball bat. It never happened again and I chalked it up to my mixing the two waxes at that particular ratio.
on a different note, i'm glad to see you make just as much mess as I do of my work surfaces. Thank god I'm not alone and I can tell DH that you're SUPPOSED to make a mess...that's what candle-makers do.
Turned that into this today. Turned out better on the color than originally thought. Thought that with the darker colors as the marble it would turn out muddy but this is what I got.
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"A wise man can see more from the bottom of a well than a fool can from the top of a mountain top."