Well I am not a music expert but I think there is definitely something wrong with the last part of the song, the part where the choir begins. Here is a MP3: http://filebeam.com/69753736d91030e08b36659301629849
Here is the FL studio file: http://filebeam.com/b26b76b6b5b761c77d453c558a8934cb
I don't think I can export it as a midi, without buying a mp3 to midi converter.

Anyway I don't know what the problem is, the tempo and harp melody seems off somehow, but I don't know how to correct this.

there are free converters