If ever there was a valid point to tell you that credit scores are worthless and are nothing more than an indication of how much interest lenders can get out of you... it when you are told that your credit score has dropped because you are using over 50% of your credit on one of your accounts... whilst at the same time telling that it's very positive that you are using less than 10% of your credit.
Whilst also punishing you for daring to move and register on the electoral roll somewhere else.