Online ACH payment put me over the limit, please help!?

I recently recieved a credit card from capital one. I have a line of $500 credit, and have been making transactions but have also been paying them off. recently I have made a couple transactions that have put me close to my limit but certainly not over it. I checked the account online today and it said it was over... show more I recently recieved a credit card from capital one. I have a line of $500 credit, and have been making transactions but have also been paying them off. recently I have made a couple transactions that have put me close to my limit but certainly not over it. I checked the account online today and it said it was over the available credit limit so i checked the recent transactions and saw that there was an "online returned ACH" payment for $100 which ut me over the limit. What does that mean and how do i fix it? Will this hurt my credit score?
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