World Chunk Moved (Landslide)

I had previously saved my world earlier, quit Minecraft then turned my computer off for some updates. After my updates and restart, I went back into Minecraft to launch my world. Come to realize after spawning in, it appeared as if a landslide happened on the side of the mountain where my house is located. Upon further inspection, various leaves from trees remained atop of the mountain while the rest "slid" down the mountain. Pictures are attached for visual.