Layer shift on the x-axis on the same layer

[Gasimoto]

Hello,

I have an offset on X axis at the same level between differents prints.

I put 2 different print extract on same photo.
Left I printed 16 head
Right I printed 6 head (I stop when I see problem)

Bambulab A1 décalage de lignes

I upload an video (very bad quality) of print and I suppose that the problem is at this timecode (the head suddenly rise) :

Bambulab A1 Combo qui lève sa tête en pleine impression

Detection spaghetti is disable

I tightened the chassis screws, re-tensioned the belts and greased the 3 axis and re-calibrated.
If I print one head with one color I didn’t have trouble

What can happen to cause the head to suddenly rise?

Thanks for advance

[Neiljt]

The one on the right looks as if it is seated slightly differently on the build plate

[Gasimoto]

I put 2 different print extract on same photo. Sorry for bad explanation

[Neiljt]

What else has been changed ?, because they look like two different prints / models and im assuming the layer shift just below the eyebrow ? is what you are referring to, which if im honest looks more like a injection mould joint more than a layer shift (edited)

[Gasimoto]

@Neiljt

What else has been changed ?, because they look like two different prints / models and im assuming the layer shift just below the eyebrow ? is what you are referring to

It is the same model from StlFlix. Effectively, it is below eyebrow and the noze