Fret Spacing Woes

I am marking out frets for the first time.  It's a short-scale diddley bow, turned out to be a 18 7/8" scale. I am using Stewart MacDonald's scale calculator.  The scale looks right, and the other frets are turning out okay, but the first fret is a full step different from the open note, instead of a half step.  I compared it to a factory-made guitar I have, and it's definitely a full step.  Any ideas what may have caused this? Thanks.

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  • Update: the action was too high, so it had a bending effect. Lesson learned.

    • Yep, which is why we use a floating bridge:  set the action where you want it, and adjust the bridge to compensate...  Glad you figured it out!

      • The nut was a screw, so I just tightened it down!  I thought about deleting the conversation, but I thought I'd let others learn from my mistakes.

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