Stephanie,
Are you referring to reply by email or reply on the web interface, or does the problem occur in both instances?
I've confirmed that the settings and behavior work as expected for me. Occasionally I have found that if a setting doesn't seem to work, changing it back and forth will get it going.
Using the web interface, reset the "Reply to" option back to "Group". Click on "Update Group" at the bottom of the page.
Select a message in the group and click on "Reply". Is "Reply to Group" selected (green)?
Discard the message.
Go?back to Settings and set the "Reply to" option to "Sender".
Check the box below for "Remove other Reply Options"
Click on "Update Group" at the bottom of the page.
Select a message in the group and click on "Reply". What option(s) are there for replying?
If the only option is "Reply to Sender", then we know that the UI is working. If not, there would appear to be a bug that needs to be reported to support.
If it is shown correctly, you should probably select a post that you made and then reply to it. Does it only go the sender now?
I also checked the behavior when reply via Gmail and although there are options for both "Reply" and "Reply to All", both only send the email to the sender.
--
Gerald