9.99 account credit used for invoice 'Renewal: VIP', credit now 23.82 
9.99 account credit used for invoice 'Renewal: VIP', credit now 13.83 
9.99 account credit used for invoice 'Renewal: VIP', credit now 3.84 
3.84 account credit used for invoice 'Renewal: VIP', credit now 0.00 
  
hmm, not too sure what happened there. o.o 
I'll forward to @Maldesto