At first I would have thought the same thing, but the little strategy card has any 3 card straight flush above that. So wouldn't the 5 7 9 of diamond be held.
On another note I had 10s Kh Js 2c 8c
Startagey card has hold 2 high cards over a 2 card royal with a 10 yet the program says hold the 10 J. Barry