They entered the score exactly as it was written, though dynamics seem to have been adjusted manually, and perhaps also note-durations in some cases; unfortunately, as I have already said, they used software (presumably Noteworthy) which (when exporting as midi at any rate) assigns a default note-length of 100 to a quarter-note instead of the usual 120. That is the reason for all those rests which aren't supposed to be there. This is a software issue, not a performance issue. The version of Noteworthy which I still have lying around is oldish, and will not load the nwc file in question, so I can't comment on it; but if the midi version of the file is opened in a midi editor such as Cakewalk (even old versions of it) and the resolution set to eighths, then the notes will appear more as I presume they were intended to. That may also work in Noteworthy, if you have an option to reduce the resolution to as low as one eighth.