Why this line?

I've been printing this cat iglo for a week now, it's never ending 😅 But I've learnt a lot about my VCore 3.1 400, but one this I can't figure out it why I get this layer bulging out at the same spot in every print.

It always comes just after or at the last top fill layer.

I'm using Orca 1.6.6 and have tried both Classic and Arachne mode. In the slicer there are no layers protruding like that.
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