Checks were printed with small amouth for old AP invoice after going live with R12 this week

AP Guru,

We went live with Oracle R12 (12.1.3) over the Thanks Giving Holidays and our business start using the R12 on Monday, 11/26/2012.

We ran our first AP check prints for our supplier AP invoices and Employee iExpense AP invovices. We came to know the R12 Payment processing also printed severla old checks with small aoumt like $0.01 and $0.18 and Wanted to know If this is normal behavior.

My questions are :

       1- Why old AP invoices with small amount printed now?

       2- Also, the check printer was printing only 20 checks at a time only.

      3- We checked our AP setup for $ check print limit and it is set $.25 . This was set in AP application and now in