This is a duplicate of reduxjs/d3-state-visualizer#12 reduxjs/redux-devtools-chart-monitor#17 and I'm just posting it here as a reminder to upgrade deps when (if) the problem is resolved.

Here is what's happening when I add three leafs to a list at the very top one by one and then remove them (also one by one):

The second (the largest) state branch is not affected at all, but there's quite a lot going on visually.

Those strange unexpected horisontal jumps probably happen because of how d3 treats ids of the nodes. If they are represented as an array and id = i, adding or removing an item in the middle of it is likely to bring in this effect.