This seems to be a conglomeration of misunderstanding and misuse.
Don't worry, I stepped into the same trap some time ago.
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You are here in the Mp3tag forum, for Mediamonkey related problems ask over there.
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The Mp3tag Tag-Panel contains some edit boxes with attached history list, which offer special preset 'commands' when two ore more files are selected, e. g. '< blank >' or '< keep >'.
These preset entries are not object to be changed by the user. -
In the erroneous case of some text has been added to the special edit box preset 'command' entry, and [Ctrl]+[S] 'Save Tag' has been performed, then Mp3tag uses this altered text value as a newly user defined list entry!
In your case, now there exist two entries in the edit box list: '< keep >' and '< keep > wedding'. -
If you want to add some text to an existing tag-field value, then use the action or converter tools.
For example see ...
Actions
DD.20130130.0901.CET