Unapplied Credits

We are using Sage Timeslips 2015.

Way back in 2011 a client made a series of payments prior to an invoice being generated. The total of these payments was $10,023.33. Not too long after, a bill was generated for the amount of the payments and the payments were applied against it.

Then a couple of other, smaller invoices were billed and paid (and seem to have been properly applied).

Several months later in mid-2012 a credit was entered for $10,023.33, the amount of the original invoice. This credit was never applied. There is no description associated with the Credit explaining why. Perhaps someone was trying to fix some issue at that time and neglected to either apply it or delete it (or explain it :)). Fast forward to 2016 and we have an unapplied credit showing up on the pre-bills. This is what it said:

New Balance

120 Days $10,023.33

Unapplied ($10,023.33)

Total New Balance $0.00

When I went into Client A/R Balance showed as ($10,023.33). So, even though I had no idea where that 120 days $10.023.33 came (client has paid everything owed), I decided I would try to get rid of the credit by "applying" it to an Invoice transaction I created in Accounts Receivable Entry (Fees, Amount 10023.33). I hit Save and I was asked if I wanted to apply the amounts in "suspense" to this invoice. I said yes. This made the A/R Balance 0. I went in and made sure that the total amount of the old credit from 2012 was applied to the Invoice transaction I entered; it was.

I thought I was all set until I ran a pre-bill. Now at the bottom it says:

New Balance

120 Days $10,023.33

Current $10,023.33

Total New Balance $20,046.66   !!!!

When I run a A/R listing, all payments and credits line up with the invoices and all payments and credits seem to be have been applied correctly. Again, Client A/R balance says 0.

Any idea what's happening and how I can fix??? Client owes nothing!