Thank you for using Sekaiju.
I've checked, but no error is occurred.
Again, please check your MIDI sequence's each event's order is exact in the event list window.
(not in the piano roll or musical score, to check the each event's order).
Some MIDI device driver may change message's order if they are sent at the same time.
Please check in Microsoft GS Wavetable Synth or other MIDI device.
If you don't mind, please send your MIDI file by e-mail with the memo of position and track,
and I'll check again and maybe find what is wrong.