This was a prickly issue, even back then. Finally, after a number of cases, the Court eventually held that indeed trial courts do enjoy concurrent jurisdiction with the Supreme Court even though the Supremes enjoy original jurisdiction, which is why almost without exception, the Supreme Court is not the trial court - again, almost.
Perhaps you don't think that's how it should work. That's fine. Everyone is entitled to their opinion. But jurisprudentially, that is EXACTLY how things do work.
If you would like more information, much can be learned from a familiarization of 28 U.S.C. § 1251, Jurisdiction and Venue.