The 1941 U.S. Open was the 45th U.S. Open, held June 5–7 at Colonial Country Club in Fort Worth, Texas. Craig Wood, who had lost in a playoff at the U.S. Open two years earlier, finally broke through and claimed his first U.S. Open title, three strokes ahead of runner-up Denny Shute in sweltering heat. Eight years earlier, Shute had defeated him in a playoff at the 1933 British Open.
It was held in the 5th month of the year
It was held in the month of June, the 5th month of the year is May. I think the model gets confused with the number of the month.