My weeping cheery tree has a branch growing in the wrong direction is there any reason why

Question

We decided to let it grow out and see what happens and I’ve noticed that the leaves on the branch that grows upward has larger leaves

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Answer 1

It appears that a shoot from the grafted rootstock has grown out. Generally, you will not want these "suckers" growing as far as this one has, since they are much more vigorous than the grafted top. They will easily sap nutrients from the weeping portion of the tree. I would remove it, and continue to remove any branches that do this in the future as weill.

These two articles will help you: https://www.gardeningknowhow.com/ornamental/trees/weeping-cherry/cherry-tree-no-longer-weeps.htm

https://www.gardeningknowhow.com/ornamental/trees/weeping-cherry/weeping-cherry-growing-tips.htm