Alberta spruce problem

Question

I have a 10 year old Alberta spruce and it has a different pine branch growing out if it. It’s not next to it but growing from it. How does this happen?

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Answer 1

Sometimes plants revert to the rootstock plant or parent plant. I'd cut the odd branch out
https://www.gardeningknowhow.com/ornamental/trees/tgen/can-grafted-trees-revert-to-their-root-stock.htm

Answer 2

This is a stem that has reverted back to a parent stock. Prune it from your tree.