There is no need for two supplements that are multivitamins even if the one contains calcium. This poses the threat of causing vitamin toxicosis which can be deadly. It is an overload of vitamins within the frog's system causing it to be poisoned.
Use a multivitamin once a week and get rid of the multivitamin/calcium mix and replace it with a calcium supplement with Vitamin D3. I don't know anything about Nutrobal.