Read what you just said. They are different issues. And whether the case is in federal court or not has no bearing on whether the Florida Court can act on a Subpeona for persons in their jurisdiction. They have jurisdiction in florida. In point of fact, if they don't have, then they've just admitted they had no jurisdiction to decide the matter in the first place.
IMHO, it is time to send in the US Marshal service and start knockin heads.
A Florida court is in no position to make a ruling on defiance of a Congressional subpoena. I cannot understand why Congress went to the Florida courts on this matter in the first place. Kind of a wasted move in my opinion.