Cobblestone Texture changes into Command Block

Usually when I load into my world, the block textures are normal, but when I load in my world on the 1.14 update that I previously played since the 1.13 update, the cobblestone texture changes into a command block! Not only the cobblestone block has been changed, but the wall, slabs, and stairs are all textured to be command blocks. Is there a way to fix this crazy issue? Thanks and here's a picture I took when this happened