Adding Payroll Field rows to the "OCR Multi-Purp Laser w/15 Rows" form

I am having some issues when trying to add additional payroll fields to the OCR Multi-Purp Laser w/15 Rows form, which we use to print payroll checks. I have customized the form and adjusted the format such that two additional fields fit comfortably when printing. We have 16 fields we use for each payroll cycle, and will likely add one additional field in the near future. 

There are two problems I experience after adding the additional fields:

1. The 16th field, which previously printed on a second page, now prints in the 16th slot, as intended. However, it also prints in the 17th slot (which should, for now, be blank). 

2. The 16th field also still prints on a second page, as before, despite now being included on the primary check. 

Has anyone experienced either of these issues previously? Any suggestions?

Thanks!