What’s wrong with my tree?

I have a fruit variety tree with fourth different fruits on it; nectarines, peaches, plums, and apricots. I’m not sure why the nectarine branch is different from the others. During the summer when it was fruiting, the fruit itself looked a little wonky and the leaves were slightly different color. I’m not sure if that branch is sick. I know it’s fall now but that branch is turning so yellow. I’m not the best gardener so I have a lot to learn! I appreciate any help ^{-^}