Sorry that you're having issues with the Finale templates. To begin solving these issues, I have a couple of questions.
Have you reviewed the ReadMe document indicating where to place the supporting files (the template files, XML files, etc.)
Are you opening one of the three template files included in the package?
By using one of the template files, there will be no need to use the Finale Library file as that Library is included within the template files.
Two items need to be set for the layouts to look correct. Since you mention that playback is correct, this indicates that you have probably set the Percussion MIDI Map for each instrument. That is the first item to set. The second is the Percussion Layout. This is set from within the Score Manager using the Notation Setting -> Selecting Percussion -> selecting the appropriate Layout from the list.
Let's start here and see how things progress. Let us know if this fixes your issues or if you need additional assistance.
iMac i7, OS 10.8, 10.9, W7
VDL2.5.5, Finale 2010-14
Kontakt 4-5, various other soft synths