Why was this a draw?

I moved to H2, not G2

1. e4 e5
2. Nf3 d6
3. Bb5+ Bd7
4. Bc4 b5
5. Bd5 c6
6. Bb3 Nf6
7. d3 Be7
8. Ng5 d5
9. Nf3 Bg4
10. h3 Bxf3
11. Qxf3 dxe4
12. dxe4 Qd4
13. a3 Qxe4+
14. Qxe4 Nxe4
15. O-O O-O
16. Nd2 Nxd2
17. Bxd2 Nd7
18. c4 Nc5
19. Bc2 a6
20. b4 Nd7
21. cxb5 cxb5
22. Rad1 Nb6
23. Be4 Rab8
24. Bc3 Nc4
25. Rd7 Bf6
26. Ra7 Rb6
27. Ra1 h6
28. Bd5 Nd6
29. Bd2 Rd8
30. Be3 Rbb8
31. Rxa6 Nc4
32. Bxc4 bxc4
33. Rc6 e4
34. Re1 Bb2
35. Bc1 c3
36. Bxb2 cxb2
37. Rc2 f5
38. Rxb2 Ra8
39. Ra2 Rd3
40. a4 Rb3
41. b5 Kf7
42. Rd1 Ke6
43. a5 Rxb5
44. a6 Ke7
45. a7 Rb7
46. Rd5 g6
47. Ra6 Kf7
48. Rdd6 Rbxa7
49. Rf6+ Kg7
50. Rxg6+ Kf7
51. Raf6+ Ke7
52. Rxh6 Ra1+
53. Kh2 R8a5
54. g3 R1a2
55. Kg2 Re5
56. Kg1 Ra1+
57. Kg2 Ra2
58. Kg1 Ra1+
59. Kh2

I never agreed to anything. I got a notification on my screen stating "draw by mutual agreement", and the game ended