KAJITHARAN_KJ_ this is normal behaviour. As far as I am aware, with both buds active, one bud becomes the main Bluetooth connector and the other merely tags along, hence the slight increase in power consumption.
Plus, it is only 5% difference. So nothing to worry about.
If it gets worse, like one bud is 50% lower, for example. Maybe start to think about getting in touch with Nothing Support.
In the meantime, enjoy your listening experience! 🔥