The evidence does not agree with itself. Either two credible sources state it differently, or the record directly contradicts the claim as stated. This is not a weaker fact — it is a finding in its own right, and the disagreement is usually the thing worth acting on.
The definition the product enforces, read from the same code the methodology page renders.
Not a weaker fact. The record disagrees with itself about this claim, and the page tells you which sources say what. On a research page the contested rows are often the ones worth acting on first, because the disagreement is where the decision actually lives.
The grade every claim on a research page carries: how it is known, not how confident it sounds. Assigned by the same rules on every scan; the rollup numbers are computed from the graded rows.
Every grade here is assigned by the same rules on every scan, and the methodology page renders those rules from the code that enforces them.