Please upgrade to 2.2 here.
The 2.0 and 2.1 branches are no longer being updated.
ReplyTo Version 0.1.8 Released
This discussion is related to the ReplyTo
This version fixes a bug where the text of a reply was being overwritten in certain circumstances by a "mention" of the user being replied to.
The "mention" feature can now be turned on and off in the plugins dashboard by the administrator. It defaults to "off", to avoid any surprises in fresh installs and upgrades.
If you have already upgraded to 0.1.7, then you should upgrade to this version.