Hello there's a chance that the changes & original document were saved in the Word document that you attached to the email. Open the document in the first email that you mentioned and see if the report is there.
When you open a Word document that is in an email, you should use "save as" to copy the document on your iPad. You can then make changes to this copied version.
Hi there and welcome
Forward the email to yourself and then open it on the iPad then open the attachment
Do you then see the missing changes?