Could those segments be Exact or Fuzzy ones? If so, WF Pro will not add them to the TM using the shortcuts in the TXML Editor unless you edit them first as it expects they are already in the TM.
There are two ways to do that:
1- To make sure every segment goes to the TM without editing (even fuzzy and exact matches and the unedited MTed segments), go to Edit > Preferences > Translation Memory > check "Write unedited fuzzy and exact matches to the TM". Now, Alt+Down, Alt+End and Ctrl+Alt+End will store everything to the TM.
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