Regarding multiple choruses issue:
I downloaded and opened the original file and it opens with 1 Chorus as midi files normally do. If the OP changes the default 1 Chorus to multiple choruses or reverts from multiple choruses to 1 chorus, the user is prompted to select to adjust the Melody Track changing to the selected number of choruses or not to change to the change of choruses. .

The choice to either adjust the Melody Track or not to, affects how the multiple choruses play.

Attached Files (Click to download or enlarge) (Only available when you are logged in)

BIAB 2025:RB 2025, Latest builds: Dell Optiplex 7040 Desktop; Windows-10-64 bit, Intel Core i7-6700 3.4GHz CPU and 16 GB Ram Memory.