It's a software problem. FLStudioMobile is a mobile music production software that can create and edit music. The exported MIDI file is damaged due to problems with the software itself, such as older software versions, improper operation, etc. It is recommended that you try to update the software to the latest version and ensure that your operations are correct to avoid unnecessary errors. If the problem still exists, you can try to contact the software vendor community for help and find a solution.