Minecraft PE glitch

I have a tablet which is a LG model v700
When i download minecraft PE on my tablet everthing worked fine it was not until i found a under water temple and started making it into a house that the game started glitching doors would change colors and shapes and so would some of the blocks in the invantory list in creative mode then it started giving me a copy of the same idem in each of the space some times it would be 4 other times it was 6 when i would switch to surival mode it would correct everthing and go back to normal.