When magnetic moments are positioned alongside a line (good approximation for thin swords), there are basically two stable configurations - all magnetic moments are oriented along the line, parallel to each other, or they are all perpendicular to the line, and anti-parallel to each other, i.e. +-+-.
What you have most likely shows that you physically have different steels (most likely phases or chemistry) at the tip and for the rest of the blade, so you've these two macrodomains anti-parallel to each other.
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