JPMorgan Chase (JPM) suffered a glitch on Monday that caused the financial-services giant to accidentally charge some debit accounts in the New York area twice.

New York-based JPMorgan is aware of the issue and is working to fix it and refund fees to customers.

It's not clear exactly how many customers were impacted by the dual charges. 

“Some debit card transactions in the New York tri-state area posted twice. We are working to reverse that and we will reimburse any resulting fees," said a JPMorgan spokesperson.

JPMorgan declined to detail what may have caused the glitch.

Chase's customer support team alerted customers of the dual-charge issue in a message on Twitter. 

"*ALERT* Some Chase debit card transactions in the NY area posted twice. We're sorry and are working to reverse that and any resulting fees," the company said. 

Shares of JPMorgan, the No. 1 U.S. bank by assets, slipped 0.52% to $45.59 Tuesday morning, dipping into their 2012 surge of nearly 39%. 

Last week, the U.S. card industry was rocked by a hacking attack into processor Global Payments (GPN) that impacted payment network operators MasterCard (MA), Visa (V), American Express (AXP) and Discover Financial Services (DFS).

The JPMorgan spokesperson said its issues have "nothing to do with" last week's security breach at Global Payments. 

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