I was firing arrows at a redstone block from above and they were seeming to hit an invisible hitbox around the block and not the block itself.

I have tried this with different placements of redstone blocks as well, same result.

If you go closer to it (inside the hitbox) they hit the actual block rather than the outside where the arrows are floating.

Firing from further away causes the arrow to ignore the outer hitbox and hit the actual block.

Removing the block causes the arrows to get really glitchy and some fall down and hit other blocks while others remain floating. Placing the block back where it was causes them to shift very slightly.