For every mapped attribute, an automatic transformation will be performed for any attribute type that is mapped to a text attribute type. The automatic transformation will change the attribute type to text so that there aren't issues during export.
For example: If you've mapped a source attribute "AnnualRevenue" that's a real number field type and map it to a target attribute "AnnualRevenue_text__c" which is a text field type, Openprise will change the data to a text field type so that it will be exported correctly. This only applies to text attributes in the target system and no other field types.
The summary section in the Run setup displays how many automatic transformations were configured in your Integration project.