I don't think there is any simple way of changing this. It relates to the Windows Region Setting list character setting, which for the UK and USA, for example, is a comma. For several European countries, it is a semi-colon. When pasting the clipboard content into the table, Word sees the comma as a separator for columns (if you select the three columns to the right of the three selected, the lower case letters would go into that second column).
You could temporarily change the list separator character from Windows control panel to a semi-colon and all the texts would go into the first column (don't forget to change it back after).
You could change the regional character with VBA, but the code sequence is complex, so if you want to explore that, take a look at
http://forums.kofax.com/viewtopic.php?f=124&t=16873