Double up payment made on single invoice after recorded

[TLS571]

I noticed this week that a supplier that I paid in December has been paid double the amount due.  I didn't record it like this.  In the pay bills history it shows two invoices doubled up, so instead of 2 there are four.  It wasn't like this when I recorded it.  I've just been advised by another supplier that they've been double paid this week so I checked and the same thing has happened.  The payments were recorded and paid electronically.  In find transactions it shows two payments made to one invoice on the same date.  Is this a known MYOB issue?  If so it needs fixing ASAP.