My baby start making noise (the noise sounds like angry mumbling) while breastfed. I try to fix the latch or my potition but she still mumbling while breastfed. Is it normal?

My personal experience, baby made lots of angry, mumbling and even grunting sounds too. Sometimes, its nothing, othertimes it could be due to a let down or even improper latching. Does this happen always? In between this is baby constantky fussing while nursing? Cheers