It's a marginal plant which means it wants to be at the pond edge with its feet in water and a few inches of water up its stem. Then all you see is what goes on above the water which is why yours looks odd to you.
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
It's a marginal plant which means it wants to be at the pond edge with its feet in water and a few inches of water up its stem. Then all you see is what goes on above the water which is why yours looks odd to you.
Ah right I will stick him in the pond then under a bit of water thanks
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https://www.rhs.org.uk/plants/details?plantid=1507