Hello,
Your question is a bit hard to answer because you do not say what kind of files are part of the template package but I'll give it my best shot:
Check if Kompozer rewrites your files so they meet W3 standards; because I believe it does!
You know: in doing so it can erase or alter stuff in the background (without you doing anything) and disable what you want it to do. Many wysiwyg editors add edit and erase stuff just upon opening a doc.
Best: download an new version of your template; (make a copy for safekeeping) and open your files with another program that DOES NOT REWRITE on it's own.
I would recommend Notepad ++ it is not a wysiwyg editor but has a very good multi colored display of your code. If you want to get better at webdesign, please try using editors like this, they leave your code clean! AND allow you to view your work directly in your browser (note pad ++ has that feature). Besides that: it is completely free and has a built in FTP feature as well.
Hope you have a windows machine because notepad ++ is not out there for the mac yet I think.
Here's their download source:
http://sourceforge.net/projects/notepad-plus/files/
If all this fails: ask yourself:
is your template complete?
Some come with a separate css file that should be correctly linked with the html page that has the content you want to see.
Also: do you have all the images with the template and are they correctly linked in your css file?
And: does the template require javascript? --> Is it's file there and is it correctly linked in your html doc?
Hope this helps,
Greetings, Michiel