Sorry for the late reply. It happened only once and it was just when I had broken up one Organization into two different organizations un-claiming some licenses from one organization and then re-claiming them again in the newly created organization. (Of course, it required Meraki to help transfer the licenses in the backend.)
I've closely watched the even logs for further/similar possible worrying events, but none were discovered so I'll mark this up as a one-time move of licenses from one organization to another glitch!