Is credit card score a sham? Mine dropped 36 points because my usage increased 5% this month. It tells me over 30% usage is bad, so I go to see what my usage is...... and it's at 11%.
Credit scores go up and down for various reasons and can change month per month. It can be a change in overall interest rates, a change in how much you're charging, a missed or late bill payment, how many other loans you have outstanding--how much debt you carry month to month, how many other agencies are checking your credit for various reasons.....damn near anything. It doesn't mean much in the short term, unless you're in the process of making a major purchase, like a new house. If you are concerned, many banks or credit cards provide a credit monitoring service for free and most don't affect your credit.