https://cust10.myfootballnow.com/player/2448

Offensive Lineman ... C not listed as a position (nor on "change position") on player page. When moving the player on the depth chart, player comes up as a 36/68 as a Center (Not far off from the other OL positions).

He does also appear as a 36/68 C when doing a player search using his name/team/position C

This might be because his snap skills are basically nonexistent, you may have those weighed lower for centers than the AI does.