Weird world gen while playing on a local server

While playing Survival with a friend of mine he loaded up an old world (made in 0.5.0 or 0.6.0) and I started to see random land everywhere but he didn't!(he didn't see the random land and walked through it as normal but I had the hitbox of the block) My friend was running a Kindle Fire HD and ALL other worlds worked perfectly! Sorry no images