Grainy thawed breastmilk

Silvia

I recently found some of my frozen breastmilk to have grainy residue after thawing it to room temperature. It smells normal & when warmed it turns back to normal consistency. I wonder if anyone know what is wrong with it?

My deep freezer went off once, but those milk weren't completely thawed so I refroze them. Is this the reason?

My LO had a few bags of it and she is fine. But I'm still concerned that's all 😫