Weird line

hi guys im modelling a european building and i made window frame and i noticed this line and i couldn’t find why is there.

It is there because of the way you modeled it. I would guess that you made the center cut-out using a boolean modifier set to difference, although I would have expected a line on the opposing side as well.

Although use of a boolean might not result in pretty topology, it might be suitable for your use case.

If you didn’t use a boolean and still want to know “why”, you will have to provide the steps you used to make this.

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