Hi @sbutalia,
The result of tree.GetEntries() does not correspond to any leaf, it is the number of entries of the tree. All the branches/leaves in a tree have the same number of entries, which is the value returned by tree.GetEntries(), in your case 199977, I understand.
What can happen is what is described in this other post:
If a branch is a variable sized array and you plot a histogram of that branch, the number of entries in the histogram can be different from the number of entries in the tree, but these are two different things. How do you obtain 3358152? Is it what you see in the histogram plot for the clustADCs branch?
Enric