Sometimes dragons will decide they just do not want something anymore. Dont offer them for a little while, let your colonies build up some and try it later down the road. Some will go back, some want. Beardies are known for doing this with crickets mostly but will do it with any feeder when they really like something else.
I supposed that they got tired of mainly roaches as the main feeders, hopefully i can get a few treats at the upcoming expo for em as well. I just hope they like roaches again soon haha, I got well over 40-50 female dubias