Import Participants giving errors on fields that are not matched or imported.

Hi.

I just tried to import 71 records into an event with Duplicate Matching off and am getting errors in 69 of the records on a field that I have specified as "- do not import -". For some reason, the only two records that have the "Middle name" column filled in are the ones that were imported without a problem. The rest of the records have blank middle name fields and they return with errors.

I'm matching on email address and not importing the middle name field at all - only event title, participant role and participant status.

I was able to successfully import the records by removing all columns from the CSV file that I would have marked "- do not import -".

I'll attach some screenshots to illustrate the issue.