Yes that's supposed to happen, its not going to disappear.
kay so like when you're going through the 5 stages of breast growth, those knots that form initially (your first breast buds) they swell and then round out into the breast itself, after that they swell again and basically that keeps going back and forth until they're done done maturing which takes way more than just 2 years.
Between stages 1-3 is when a lot of the initial growth happens like nipple/areola growth, once you reach stage 4 its like a second breast bud appears. It happens after the initial breast bud has rounded out into the chest completely, its pretty obvious when it happens, at least it was for me. Im currently between stages 4-5 like my 2nd mound has started to round out and dissipate into the breast so my boobs have gotten a bit bigger in recent time.
As long as your T is being properly blocked and you feel good at whatever E levels you're at then no need to fret, just have to let your body do its a thing.