The umpire called the hit a home run. He ruled the player was out of bounds when the catch was made.
Incorrect call...IMO.
A couple of questions:
1) How many umpires on the crew for that game?
2) What base was the runner on?
3) What rule set was the tournament played under?
4) Did the umpire(s) get an argument from the defensive team HC after making the HR call?