Hello @Petter, I know you founded the answer but I would like to add more information about it.
If a contact replies to an email while still active/enrolled in the sequence, then the contact will be unenrolled and receive the status of “Contact replied to email”.
However, if the contact replies and they are no longer active/enrolled in the sequence (for instance because they have run through the sequence and all the steps have been executed), then the status will not update to “Contact replied to email”.
If the Sequence has only 1 step, it’s expected that any replies that happen after the Sequence will not update the status as it is happening after the Sequence has ended.
I hope this information helps.
Pam