If you could answer these questions, it will help us out.
How old is your dragon?
How long have you had your dragon?
How long is your dragon?
What is the sex of your dragon?
What size enclosure do you have your dragon in?
What type substrate do you have on the bottom of your tank?
Do you use UVB lights?
If so, Is it a coil, compact, fluorescent tube, or Mercury Vapor bulb?
What is the brand name and number of your bulb? Wattage (if MVB)?
How old is your
UVB bulb?
How close can your dragon get to the UVB, and where is the
UVB bulb located?
Do you use a separate basking bulb? What kind and what is the wattage? Is it a white or colored bulb?
Di you have any type of night time heat source (ceramic heat emitter, colored bulb, etc)?
How long are lights on each day?
What are the basking temps?
What is the cool side temp?
What is the night time temp?
Do you take the temps with a stick on thermometer, a digital thermometer with a wire and a probe end or a temp gun?
Where exactly are you taking your basking temps?
Do you use a heat rock or heat pad?
What do you feed your dragon? Please be specific.
How often do you feed and what time do you feed (morning, afternoon, night)?
How many live feeders do you offer at time?
Do you gutload (feed) your crickets, worms, etc?
Do you use vitamin or calcium supplements? What brand(s)? How many days a week do you use each of them?
Is your dragon having regular bowel movements (poops)?
Do you
bathe your dragon? How often?
Do you mist your dragon or offer water other than in the
bath?
Have you gotten a vet check and fecal done?
Does your dragon share an enclosure with another dragon?
However, as the previous poster said, you really should seperate them, and purchase a new
UVB light. Also, mealworms are not a good feeder for beardies. They can easily impact them, and nutritionally they don't offer much. If your dragons are over 16 inches, superworms would be a much better alternative for them, and they don't cost that much more than mealies.
You should also change the substrate out asap. Newspaper, non adhesive shelf liner and slate tile are all cheap easy and safe alternatives.