As in these two snapshot......redstone connect to the sticky pistons,but only the two sticky piston that next to lever activated,the others with redstone didn't.
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As far as I can tell, this is working as intended. Redstone does not power blocks directly beside it or above it unless it is pointing to them, and it is connected to the pistons visually because it is actually only connecting to the redstone you have placed under the pistons. You can power the pistons by running the redstone one block higher or by running repeaters into the block below the piston.