It seems there's been a slight error...

Meaning

Politely pointing out a mistake.

Examples

• John: The invoice shows a discrepancy in the total amount.
• Alice: <b>It seems there's been a slight error</b>… in the calculations.
• John: Could you please check it again?
• Alice: Of course. <b>It seems there's been a slight error</b>… I'll issue a corrected invoice.