Token adding number unexpectedly

While running a game some of my creature tokens unexpectedly had a red number (I saw a 2 and a 5) appear in the top right corner, which seemed to format just a little to the right and under the top right status icon that the token had on it. Is there any documentation on this behavior? I'm running this at a subscriber level. I didn't notice exactly when the numbers appeared, so I don't know what action prompted the behavior, and certainly no idea what it is intended for.

From the wiki (emphasis mine): https://wiki.roll20.net/Token_Features

5. Status Indicator Overlays:

This button rolls out a menu that gives you a series of colored dots, a red X and over 40 different status icons that overlays over the Token image. You can use these to show status, ailments, or to differentiate multiples of the same Token type. You can have multiple Overlays displaying simultaneously.You can also add a numeral to individual Overlays by mousing over the desired Overlay in the rollout menu and tapping "0" through to "9" on the keyboard or numpad. A red numeral will appear on the Overlay. Tapping "0" will clear the numeral from the Overlay (but the Overlay remains until it is clicked again in the menu).

The default position for the overlays is across the top of the token, but you can choose to have them run along the bottom, right or left side by going to the"Token Bar Colors + Display Settings" section on the My Settings tab on the Sidebar and selecting the layout from the "Marker Position:" drop-down menu.

Thanks! I guess I had overlooked that portion of the overlay description.

No worries! I think it was 6 months before I happened on it. =D