Block acting weird on top snow

On switch you can hold LR to place many blocks in a line. A bug I ran into was well taking advantage of this in the Arctic biome well prepping a game for me and a few of my friends and well making a wall on top snow it doesn’t go in a line it goes up at the 1st block and the longer I built the higher the little tower went. Even though it kinda sounds like a fairy tail with the way I worded that but yeah.