I was making sure all of my player’s tokens had updated correctly after they leveled up a couple days ago, and they hadn’t. I checked the tokens to see if they had become unlinked or if I need to change the attributes. All the tokens are still linked to the character sheets, but when I click the attribute drop downs the only option is “none”. I’ve tried unlinking and relinking the tokens, I’ve tried using new tokens, and I’ve made sure the character sheets were open and fully loaded. Nothing is working. All of the roll20 NPC character sheets are still linked correctly, so I can’t figure out what the issue is.
Oh, I’m not sure what changed, but the tokens are linked correctly and updated today. Maybe just a temporary bug. Anyway, problem solved I guess 
Glad to hear it fixed itself! If you run into trouble in the future please don’t hesitate to let us know.