Before the steam migration I played destiny 2 al the way up to the forsaken dlc. While doing so I got the max light level at the time ( i dont know the exact level but it wasnt 750) but after the migration it said that my main character my hunter I completed everything on was the same level as my warlock, which I found strange. When I logged in to the game it was making me restart all of the dlc again and all my item's light levels where down to 750.