I'm sorry that the "Last Modified" sort feature is not working properly. I went into your account and was able replicate the issue. However, if you change the sort feature to "New-Old," the emails will sort in the order in which they were last modified. I have currently tracked this issue on your account for our engineers to look at. If you would like us to notify you when this is fixed, please email us at Social_Support(at)ConstantContact(dot)com with the best contact info. We will make sure you are contacted as soon as there is a resolution. I apologize for any inconvenience.