Simple Odds Question..

[stealyourface]

Ok so I was thinking of a theoretical hand, and ran it through the odds calculator on Card Player.

Hand 1: QhKh
Hand 2: Js5s

Flop: 10hJh2d

Now card player says that hand 1 is a 68.9% to 31.1% favorite.

I was always told that for an easy odds estimate on the flop, you take each out and add 4% for each one.

By that logic: 9 hearts, 3 Qs, 3 Ks, 3 As, and 3 9s...

(9+3+3+3+3) x 4 = 84%

what the hell am I doing wrong?