OK, I've replicated the league as per your settings and this is what I got for the first (2018) Draft:
On your Draft Pool screen, check if any of the later Classes have been populated.
Whatever the case, something hinky is going on at your end. And - re Bo Bichette coming in for 2018, not 2016 - at the game's end as well.
Maybe try it again with the right to refuse minor league assignment UNCHECKED?