I imported vocal in mp3 format,
and then I adjust the beat using the 'Audio Edit' with Marker mode (Audio Wizard Chord) by adding bar lines.
And then I add chords with styles to the song.
It sounded synchronized and perfect during playback.... but when I rendered to aiff/m4a/wav , it became messy and out of sync.

Can anyone show me the right direction to add synchronized vocal with chords?

Thank you

System: Mac High Sierra BIAB 2018