Endgame Fortress

I reached this endgame as black in an OTB tournament. It was a draw by fifty rule. I played this against the engine. It was a draw by threefold. BUT WHY DOES THE ENGINE SAY WHITE IS BETTER???? ISNT IT EQUAL???? OR IS THIS JUST NOT A FORTRESSS?????

Engines often don't understand fortresses. Probably the only area where humans can have a better understanding than engines.

You have to look at the CHANGE of the high evaluation. 50 moves +5.9 - +6.1 means it's a fortress. :) The same with wrong bishop or something like that, 30 moves "+3" without alteration means =.

1R6/8/4pkp1/5n2/5P2/5P2/5K1P/8 b - - 1 1

A high evaluation does not automatically mean that someone is winning, There has to be the potential of improving the position. So, a "very good" position (+/-) which cannot be improved is not very good. This has been well known long before the engines arose...

Some general things: In fortresses one side often is clearly better, just it's not enough to win. In this specific position it actually is winning, Stockfish:
Neue Partie
1R6/8/4pkp1/5n2/5P2/5P2/5K1P/8 b - - 0 1

Analysis by Stockfish 240417 64 POPCNT:

1...Kg7 2.Ke2 Sh6 3.Ke3 Kf6 4.Tf8+ Kg7 5.Ta8 Kf6 6.Ke4 Sf7 7.Kd4 Sh6 8.Tf8+ Kg7 9.Tc8 Kf6 10.Kc5 Ke7 11.Tc7+ Kf6 12.Kd6 Sf5+ 13.Kd7 Kf7 14.Kd8+ Kf8 15.Th7 Kg8 16.Te7 Kf8 17.Txe6 Kg7 18.Kd7 Kf7 19.Ta6 Se3 20.Kd6 Sc4+ 21.Kc5 Se3 22.f5 g5 23.Ta7+ Kf6 24.h4 gxh4 25.Kd4 Sf1 26.Th7 Sg3 27.Kd5 Kg5 28.Ke5 Se2 29.f4+ Kg4 30.Txh4+
+- (128.27) Tiefe: 60/103 00:27:25 20050MN, tb=321424285
(Doe, 01.05.2017)

+128 is Stockfish's way of saying "forced win".

Oh yeah, I accidentally messed up when setting up the position. there was no h-pawn. Just double g-pawns.

So you mean this position? 1R6/8/4pkp1/5n2/5P2/5P2/5K2/8 b - - 0 1
Stockfish instantly evaluates this as draw for me:
Neue Partie
1R6/8/4pkp1/5n2/5P2/5P2/5K2/8 b - - 0 1

Analysis by Stockfish 240417 64 POPCNT:

1...g5 2.Kg2 gxf4 3.Kh3 e5 4.Tf8+ Ke6 5.Th8 Se3 6.Th6+ Kf5 7.Th5+ Kf6 8.Kh4 Sf5+ 9.Kh3 Se3
= (0.00) Tiefe: 120/18 00:00:32 342MN, tb=5830417
(Doe, 02.05.2017)

White draws | 6bk/5pp1/3N1p1b/8/4p1p1/5PPp/4pPNP/4K3 w - - 0 0 |

1. Nh4 exf3 2. Ng6+ fxg6 3. Nf7+ Kh7 4. Ng5+ fxg5 1/2-1/2

6b1/6pk/6pb/6p1/6p1/5pPp/4pP1P/4K3 w - - 0 4