[fwdude]

...it means that based on the upper court’s decision, it is typically remanded back to the lower court to then render a decision consistent with the upper court’s decision.

Then, why doesn't the upper court just reverse the lower court's decision with its own opinion as it does numerous times in other cases?

[SgtHooper]

It many cases it can be a clear reversal. But it still goes back to the first court to then clean-up any issues inconsistent with that decision. Such as damages, injunctions, etc., that the first court may have errantly decided. It is essentially a feedback loop.