You’re correct. What probably had happened was that the original (Legacy) version of it from Volo’s Guide was CR ¼, and when they added the newer version from MotM, they probably ported the data from the original and missed the CR change. The legacy version should be CR ¼, the new version should be CR ½. Good catch.
The book says it's CR 1/2 but the website says 1/4
You’re correct. What probably had happened was that the original (Legacy) version of it from Volo’s Guide was CR ¼, and when they added the newer version from MotM, they probably ported the data from the original and missed the CR change. The legacy version should be CR ¼, the new version should be CR ½. Good catch.
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This has been fixed - thanks for the report!