One of my players' die rolls always show up in chat as green, even if it's not a critical hit, is this a bug or did we enter something incorrectly?

Like I said, not sure if it's a bug or not, but I felt like this was the best forum to post it in.

From the Roll20 Wiki: If an inline roll contains a crit success, it will be highlighted with a green box. If there's a crit failure, it's highlighted in red. If it has both (because there was more than one roll), it's in blue. Also when you mouse-over the inline roll to see the details of the roll, it'll show red and green highlights for the rolls themselves for crits/fumbles. Check the inline roll's tooltip.