Can't process super payment for 1 employee

Hello  all,

Can anyone possibly assist with this issue? We have an employee who ceased employment with us some time ago and was terminated and made inactive. The employee then returned working for us months later, at which point a new employee card was set up for him. His old employee card had the words "(OLD)" added to his surname and his super fund details were changed on the old card so as not to contain anything that appears on the employee card.

I have just processed a month's superannuation payments for our business which includes super for the new employee card for this person, but I had to exclude the employee from this payment. The error I am getting is "This super fund membership number is also used by (the error then references the old employee card's name). Please enter a unique number for each employee" 

My problem is, the old inactive employee card does not include the same super fund membership number as the new card. I am not paying superannuation from the old employee card. The super details have been completely removed from the old employee's card. I've logged out, logged back in and can only see this super fund membership number, listed under the new employee card.

I can't determine how to get this payment to process for the employee's correct new card. Any thoughts? I'm at a loss as to what to do next.

Thank you.