Sizing is not exact but has no way to cut to size (?)

From reviews and from the online order, it looks like you buy your shoe size. Mine is size 6. But I bought that and received and insole size 6-12. This is a lot of sizes to cover. And there is no way to cut it short due to the stitching. I feel like I either got something different than the other reviewers or I am missing instructions. I can say the insole is much larger than a 6

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