There are several reason to get a little tickle.
Is the tape a piece per shelf or one long strip?
Could be worn sections of its one long piece.
Either way I would check all connections and solder them if capable.
Electrical tape, Liquid tape, Moisture Seal are the things you want to use that are made to insulate a current.
If the tape is worn from tub rub then you will want to replace it.
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