In my BPQ, our team are Bucc(with knuckle), DK, Assasin; while enemy have Bucc(with Gun), Archer, and Hero. I have the video if needed but too to directly upload. Below is the screenshot from the video I recorded.
It is definitely a bug. As it says "Ranged characters will also apply to the following, if a claw or gun is equipped: Brawler, Marauder, Buccaneer, Bandit, Chief Bandit and Shadower." in https://royals.ms/forum/threads/update-66-1-12-07-2020.166932/ But this post had been a while, not sure if it is fixed or not.
It could also just be bad luck. Matt mentioned that if there is an uneven distribution of "ranged" characters entering BPQ then a team may end up with less ranged characters than the opposing team.