Are they housed together or separately? If it's together, it may be that you have a dominance issue. If one of them is getting dominated by one or more of the others, it could stop eating. Separating them would solve that. If they're already separate, I have to admit that a juvenile not eating and losing weight worries me.

Has anything about their situation changed? Moved to a higher traffic area in the house, moved residences, etc? Anything that could cause them to be stressed?

If they're housed separately and no new stressors have been introduced, I'd be contemplating a vet visit just to check on their general health. If you can get a (fresh) fecal sample to the vet, they can check for parasites, etc, and recommend a course of action.
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0.1 Albino Leopard Gecko - Tigger
0.1 Crested Gecko - Pooh-Bear

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