User sends email to several recipient, not a distribution group. Recipient replies and original sender is replaced in To: field with distribution list that seemingly has no relationship to email thread and recipients.
Please check the message header of the emails for the Reply-To part.
How to view message header in Outlook: View internet message headers in Outlook
If the Reply-To part shows the distribution group, the possible cause of this issue may be the senders configured Reply-To settings to have the recipients reply to a different email address.
(By default it should be the same as the sender's email address)
For example, if using Outlook it can be done in this way:
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