Singular pieces of redstone do not power anything. For example, a piece of redstone behind a dispenser does not power the dispenser when powered, but if it were 2 pieces it'd power it fine.
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Could you provide a picture of what you're talking about? This description is unclear, because "a piece of redstone" is more commonly used to mean redstone dust, and I'm sure you know that redstone dust doesn't power anything by itself. You might be talking about a block of redstone, but if so a picture would be needed for us to be able to reproduce the problem. If we can't reproduce it, it's almost impossible to fix it.
If you can't provide a picture, at least try to describe how your components are arranged, using the names of blocks and items as they appear in inventory.