A witness can describe the same doorway accurately from a different side.

Two people can give completely different descriptions of the same doorway and both be telling the truth, because each saw it from where they stood. Conflicting accounts are not automatically evidence that someone is lying, and treating them that way loses the information that the differences contain.

When accounts disagree, try mapping where each person was rather than deciding who to believe. Often the versions are compatible once position is accounted for, and the combination is closer to the whole than either alone. Save your suspicion for accounts that could not both be true from any position.