#1 TDC question

After I checked TDC and cam centerline I happened to look at the dots and the cam was 180 from the dot to dot position at #1 TDC. I am like, WHAT? Thought I did everything 180 out and then checked and re-checked and put it back the way it was, but dot to dot is #6 TDC. The books are useless for this, and I have 3 different books.
If the engine is in the car this could really drive someone crazy.