Is it reversible error when an appellate court overturns a trial court's grant of a new trial when, first, the decision to grant or deny a motion for new trial is not reviewable; and second, the trial court's grant concerns factual sufficiency, which is not to be confused with legal sufficiency and the due process standard of Jackson v. Virginia, 443 U.S. 307, 99 S.Ct. 2781, 61 L.Ed.2d 560 (1979)?

Does the law-of-the-case doctrine prevent a high court from considering the correctness of an appellate courts decision?

Is an appellate court's reversal of a trial court's grant of a new trial reviewable?