Hey guys created a new sandbox league and went into playbook section of the game right away and saw a bunch on blank boxes as I had not put in any custom playbooks yet. The only way I could find to get custom playbooks to appear with custom selected was to change from custom to each of the coaches playcalling to see their playbooks to appear.

normally for teams it won't set those values until it needs them... so if you haven't gotten to preseason yet it's likely the coach logic hasn't been triggered yet. But I'll double check.