how old is your dragon? soemtimes when they are old it stinks. have you had a fecal test done? might wanna think about getting one done if you havent. just to check for parasites and stuff cause that can cause stinky poop too.
Beardie poop does have a smell to them, but if you can smell it from across the room and after cleaning it up, then it could mean that your beardie has some form of parasite or can't properly digest his food. The poop should not be runny or reddish in color, unless he'd eaten something that's red.