If part of the cam is turning with the locking tool in place, then the cam is broken. I can't think of any way that would be possible if the cam were still one piece.

What method did you use to reinstall the cams when put the head back together? They are kind of brittle and will break if you're not extremely careful.

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2002 X5 4.6is - Imola Red/Black (Sold)
2001 740i M Sport - Anthrazit Metallic/Black (Sold)
1998 M3/4/5 - Technoviolet/Dove (Sold)
2003 Z4 3.0i Sport - Sterlinggrau Metallic/Black (Sold)
2009 Mini JCW (The Wife's)
2015 i3 REx - Arravani Gray/Tera World (Daily Driver)