Right breast more efficient than left

We had a rocky start to breastfeeding and I expressed in the first week but have now been exclusively breastfeeding. My right breast is always full it seems, no issue with supply for her feedings but my left seems to be lagging behind... I’ve been expressing on the left to bulk up the supply but it hasn’t made a difference. Will this become an issue as my baby’s feeding demand increases as she gets bigger? I’m worried what issues we’ll have if this continues 😓