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emails missing; and messages now thread in folder. I don't want them to thread

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I went looking for an email this morning that had an attachment. The email is gone! I find my response to my client asking a follow up question. The his original email is GONE as is the attachment.

This morning I responded to an email and hit send. The next email I went to respond had it's original subject line but the body of the email now contains the previously sent email! This is nuts!

And when I moved a large group of emails that were related to a folder Thunderbird now threaded them. I want my emails to be kept individually. Single; no threading conversation.

How to undo all this damage? Please

I went looking for an email this morning that had an attachment. The email is gone! I find my response to my client asking a follow up question. The his original email is GONE as is the attachment. This morning I responded to an email and hit send. The next email I went to respond had it's original subject line but the body of the email now contains the previously sent email! This is nuts! And when I moved a large group of emails that were related to a folder Thunderbird now threaded them. I want my emails to be kept individually. Single; no threading conversation. How to undo all this damage? Please
Attached screenshots

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I receive email from one email address that Thunderbird changes the content of. As the screen shots reflect in my last query. Every time I get an email from that account Thunderbird changes it to the last email I read.

This started happening with the last update. Something has been broken! I've received emails from the account for YEARS.