Layered image weird behaviour (probably my fault)

[Doogy]

Hi,
I got a weird thing happening...
I use a Picker function in a layered image to select attributes on the fly and I got some attributes even before the Picker function execute :/
This is my Picker function:

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    class Picker(object):
        def __init__(self, girl):
            self.girl =  girl
    
        def __call__(self, attr):
            renpy.log(str(attr))
            return attr

This is my layered image:

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layeredimage morgan:
        attribute_function Picker(morgan)

And when I do 'show morgan' this is the log I get:

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RevertableSet([u'casual', u'normal'])

Do you know what I could have done wrong ?