Blocks respawning along chunk borders

So on my minecraft realm, we have an old world, and recently I have noticed that random leaf blocks are appearing as if part of a tree along a chunk border, upon destroying them and unloading the chunk and reloading it they have respawned as if never deleted in the first place, is there any way that I can remove them permanently as it is effecting the "immersion" of the realm world I am working on