The storm chases the convection on the hour 22 NAM and splits into two lows at hour 23. Then it takes until hour 29 for the western low to take over, but it's further east and 8 MB weaker than 6z. And moves east instead of north once it does.
This all likely happens because the trough shifted slightly east, which bumped the initial surface low just far enough east to where it could chase that convection.