Hi Rosie,
Thanks for contacting us! Thank you for your patience and I’m sorry to hear about this issue with the attendees/orders report.
Would you please provide us your system information and your CSV so we can replicate your site info in a testing environment?
1. Post your site’s complete, un-edited System Information according to the instructions found in this article → https://theeventscalendar.com/knowledgebase/sharing-sys-info/
2. Upload your CSV file somewhere where it can be downloaded, then share a link to this place so that we can download that CSV file and test it out ourselves.
↑ These two steps will give us information that should help us figure out what is going on here.
Thank you for your patience,
Juan.