Weird edge appeared after using subdivision surface modifier

so I used subdivision surface modifier and a weird edge appeared on the top part
of the chest section and the head section of the model.

image

what is causing this ? will removing / deleting this affect anything ?
this edge starts off from some vertex and usually parallel in the beginning to some
edge that is already there

image

image

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They look like superfluous edges probably accidentally created.
Save, then just delete them. See if that sorts it out.

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I applied the surface subdivision modifier and then deleted the extra edges,
did not cause any problems thankfully.

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