Creeper blows up WAY TOO Fast. Can you help please?

For some reason I don't know why. Whenever I'm near a creeper in Minecraft Windows 10 Edition and Pocket Edition, It blows up super fast. I have no time to react and it's crazy! Sometimes I'll be 4 or 5 blocks away from a creeper and I'll see it already start to blow up. Can I please get some help?