Rain Weather ( Not the Particles ) Can go through the blocks and my Roof!

When I joined my Minecraft Pocket Edition Singleplayer Survival World, It started to rain. I went inside, and....The Rain was passing through my roof, I went caving and the rain was inside the cave! The Rain Simply can slide through every block! I'm not talking about the rain particles, I'm saying that the Rain can be visible under blocks! This issue is only on the iPhone 5s! Other IOS Devices do not have this bug! Thankyou for reading my big report! Keep up the good work! - RageBlazeYT