Rockshox pike solo air internal clunk...

Evening all,
Just received a second hand pair of new pike's in the post. When I move these upside down or past horizontal I can hear something inside the air side leg sliding to a clunk, move the forks back to upright and it slides back down. Firstly, is this normal? Does anyone know what it is? Do I need to sending them back?
Thanks all
Just received a second hand pair of new pike's in the post. When I move these upside down or past horizontal I can hear something inside the air side leg sliding to a clunk, move the forks back to upright and it slides back down. Firstly, is this normal? Does anyone know what it is? Do I need to sending them back?
Thanks all
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