Repeatable fields should have the exact same field name except the number at the end should increment from 1, with 1 being the first row (or set) of fields, then only map the first row of PDF repeatable fields. The plugin will automatically recognize the additional fields based on the field name and number at the end.
It sounds like you may be mapping the additional fields (2,3,4) too.
Follow these instructions exactly, if you are getting different results, use this form to send us a screenshot of the field map layout showing the mapped repeatable fields, and attach the PDF for further review and to allow us to be specific with our support.
We remain at your service.