Whenever I shot an arrow in survival mode, so far the custom ones, when I pick it back up I get a whole new stack of that arrow
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You have reported this under Mojang Web services, you should be reporting this under minecraft for whichever platform you are playing on.
Can confirm this - though it doesn't do it for spectral arrows, either, just potion arrows, and it's not always a stack. It adds the number of arrows in the stack it was fired from before it was fired.
That means if you had 64 arrows in the first available stack of arrows when you fired the arrow, you will lose 1 arrow when it is fired, thus have 63 arrows. When you pick up the fired arrow, you will have 64 arrows + 63 arrows in a new stack because you picked up 64 arrows. You can essentially double your arrow count if you fire an arrow from a stack that has at least 2 arrows.