A pile of scraped up and disrupted regolith is ...

A pile of scraped up and disrupted regolith is dumped onto a hopper. The arm then goes about the normal routine of scraping and digging, with consequent vibration of the lander. If there was no movement of the soil it would be weirder than what we see.

If we have both static and ferromagnetic influences in a (very) dry powdery sol then couldn't we expect some strange looking structures to eventuate?

I guess we all suffer from confirmation bias in our perceptions of what we see.