Incorrect email plain text to recipients - a bug?

[Aubrey_Morgan]

We have noticed very recently that several of our emails are sending the wrong text version of our emails to some recipients.  The copy for both the HTML and text reflect properly (we even sent tests of plain text multiple times before sending to confirm), however it looks like the text version that was sent to several recipients was the one from the text version from the original email we cloned, mentioning incorrect dates and referencing incorrect links.

Has anyone else had this issue? Is it a bug or is there something I'm missing?

Thanks in advance!