I have tested again in Asterisk 13, latest FreePBX. What you see happens when a call is NOT bridged, and because FreePBX changed the way that runs checks on recording and other stuff for doing Gosubs.. that generates events NewExten with priority 1 and an extension used for what before was a macro (not a numerical extension). That text is cleared as soon as the call is bridged/connected to the other leg.
Anyways, I made some checks to not set a dialed number on newexten/priority 1 if it is not a number. So it will skip no numeric extensions that you might traverse in your dialplan before the actual dial is being done.
Is a fairly minor issue, and related to the way the dialplan changed in the latest FreePBX version. FOP2 2.29.01 will prevent those from happen.
http://download.fop2.com/fop2-2.29.01-centos-i386.tgz
http://download.fop2.com/fop2-2.29.01-centos-x86_64.tgz
(2.29.01 is not yet final)