Had to clean and re-fill my bottle (label remover) soaking bucket so it was a great opportunity to not waste 23L of water finding the 23L mark on a Speidel. If we assume my 2000ml beaker is fairly accurate, 11.5 fills brought my Speidel to the bottom of the ring, just above the label. The RJS RQ French Rose in the 6gal carboy just came out of primary and is in a carboy that I had labeled as "larger." I label all my carboys as small, medium, or large as they tend to vary by a noticeable amount. The kit was 18L of juice that I had to add exactly 5L of water to bring it to the same mark on the Speidel. Hundreds of 18L kits have produced the same results.
I'm not trying to tell anyone else they're wrong, just to double check your marks for accuracy. Maybe Speidel had a run where their tolerances were off or just plain different. But my original is years older than the next two and all three measure the exact same 23L mark:
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