When you activate redstone on top of a block with two pistons below it, it supposed to activate them both, at least that whats it's like in the PC version. Check out the screenshot if you didn't understand.
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No, this is intended behavior. In PE, they fixed the bug that caused pistons to be powered from 3 blocks away. (Redstone can strongly power the stone bricks which will weakly power the piston causing it to extend, but the piston below should not activate because there is no strong power adjacent to it.) Weakly powered blocks should not power other blocks, and this bug, commonly known as quasi-connectivity, should have been fixed a long time ago in the Java edition, but wasn't because people complained that "all our favorite contraptions exploit this bug". Luckily they have decided to keep the PE/Win10 free of this "bug feature" nonsense and try to make redstone follow logical rules in this edition. So this issue can be closed.
@unknown is right. This is indeed an intended behavior and is a duplicate of MCPE-14664.
@unknown is right. This is indeed an intended behavior and is a duplicate of MCPE-14664.
@unknown is right. This is indeed an intended behavior and is a duplicate of MCPE-14664.