Block not displaying in item frame at all

I use a Motorola droid maxx. I searched, but could not find this exact issue. I saw the opposite, but not this. When using an item frame for my redstone creation, I place a block into the frame, it doesn't show up. I go to break the frame, and the block jumps out. If I place a regular item in frame, or redstone dust, it displays fine. See attached. The cobblestone was in item frame as shown in second photo, and I broke it, and it jumped out.