missing from depth chart

Hi. Just upgraded from 2018 to 2019. Went in to set depth charts only to find that my only my starting FB is listed as an option at FB. I have three FBs but I can only enter one of them on the depth chart. Any thoughts?
https://www.draftdaysports.com/board/
https://www.draftdaysports.com/board/viewtopic.php?f=282&t=30376