I had that problem as well until I deleted the voice tags for the double entries and then re-recorded them. I use an old SE Z600 and it does everything OK - evening showing the correct icons for work, home etc. My Moto V3i just showed the generic telephone icon.
There is dual (or more) entires for cell, home, work, etc.
However you can mistakenly import all entries twice (or more) and this will duplicate each identical entry each time. If you do this remove all entries and the import again. (Now how would I have found this out?????) ;-)