Difference between single value and serie

What could cause difference between single value and serie?
Black -correct- comes from single input value.
Green from vector.

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collection vs single - serie.gh (14.1 KB)

Probably this list/tree mismatch ?

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You may also want to calculate the correct rotation angle after the rounding.

collection vs single - serie.gh (22.6 KB)

Thank you! I missed those graft :+1: