Downloading a world from someone else seems to be glitchy

When I try and download a world from my tablet and put it on my phone, the world is exactly like it was before I did anything to it, but some small 3x3 - 9x9 chunks of what I've build are there;sometimes there is nothing there at all! If you don't know what I mean, look at the attached file. If this is NOT a glitch then... well... I'd look like a complete idiot!