BUG in GUI (Chess Tournament) or engine?

[Eduard Nemeth]

Who can help me to find what is wrong here?
I have outplayed a current grandmastergame between Stockfish 20180910 (32 Bit) and Komodo 10 (32 Bit) on my Android Tablet.
As GUI I used the App "Chess Tournament" by Javiolo from the Play Store.
As book I created a pgn File. Game started from move 29.
After 48 moves game finished to my surprise draw, with a Score +2.
Threefold repetition? No!

Here is the game in PGN:

[Event "testing"]
[Site "ChessEnginesTournament"]
[Date "2018.10.13"]
[Round "1.1"]
[White "Stockfish 9 20180910"]
[Black "Komodo 10"]
[Result "1/2-1/2"]
[WhiteElo "1500"]
[BlackElo "1500"]
[ECO "A48"]
[Termination "normal"]
[TerminationDetails "Draw, Threefold repetition"]
[EventType "match"]
[Source "Analyze This App"]

1. d4 Nf6 2. Nf3 g6 3. Bg5 Bg7 4. c3 O-O 5. Nbd2 d6 6. e3 h6 7. Bh4 c5 8. dxc5
dxc5 9. Qc2 Nc6 10. Bc4 Na5 11. Be2 Be6 12. O-O Qb6 13. e4 Rfd8 14. Rfe1 g5 15.
e5 gxh4 16. exf6 Bxf6 17. Ne4 Bd5 18. Bf1 Kg7 19. Qc1 Nc6 20. Qf4 Bxe4 21. Qxe4
Rd6 22. Bc4 Rg8 23. Qf4 Qd8 24. Qg4+ Kf8 25. Qh5 Rg6 26. Bb3 Qd7 27. h3 Bxc3 28.
bxc3 Qxh3 29. Qxh6+ Rxh6 30. gxh3 Rhg6+ 31. Kh2 Rgf6 32. Re3 Rf4 33. Rg1 Rdf6
34. Bd5 Na5 35. Rg4 e6 36. Be4 Nc4 37. Rd3 Rxg4 38. hxg4 Rf4 39. Bxb7 Rxg4 40.
Rd7 Rf4 41. Kg2 a5 42. Rc7 Nd6 43. Bc6 Nc4 44. Bb5 Nd6 45. Bc6 Nc4 46. Rb7 Nd6
47. Ra7 Nc4 48. Rc7 1/2-1/2

[Eduard Nemeth]

Note: There is an update of "Chess Tournament."

Thank You!

[stevenaaus]

The final position *has* occurred three times.
43. ...Nc4
45. ...Nc4
48. Rc7
5k2/2R2p2/2B1p3/p1p5/2n2r1p/2P2N2/P4PK1/8 b - - 13 48