This issue is normally caused by too many keepers being added to teams, keepers being assigned to the wrong pick or no pick, or the wrong roster size being set.
For the Keepers Go to Draft Settings, then Click or Tap Keepers. Go through each team and make sure there are no keepers added that shouldn't be there. Click the Edit button to the left of each player to make sure they are assigned to the correct pick.
To change the Roster Size, go to Draft Settings -> Basic Settings and then edit the roster size box.