Sugar/Citric Acid Coating giving Gummy Bears a Wet Look
I've never eaten soft sour candies. Is the sugared  coating sour too or just the body of the candy? 

The reason your candies became sticky is citric acid is generally sold in the anhydrous form. Citric acid exists in anhydrous and monohydrate forms. In the anhydrous form, it's plain citric acid with no water molecule attached. Monohydrate form has a single water molecule attached to the single citric acid molecule.

The anhyrdous form of citric acid is hygroscopic  - which means it attracts and absorbs water from surrounding air. I don't know if there's anything that can be done at this point since anything you tried to dry them (like heating them) would only melt the Gummi bears. And they'd only rehydrate afterward in anything you did that succeeded in driving off the water. It's the nature of citric acid. I use citric acid and keep mine in a glass jar with a tight lid and a few packs of silica gel to absorb moisture and it still tends to clump.

Why not remelt the batch treated with citric acid and make slightly sour ones but coated only with sugar.