The 2nd lead need to be toned down in volume/velocity. It's supposed to simulate an echo effect in some of the spots.
This sounds... converted.
Some notes are off, too. As if they went out of range on the synth.
If you're using a soundfont, whatever the lead instrument is may not have a high enough range to play some of those notes, which explains the tune playing the highest possible note, and sounding off-tune.