Why are only a couple of my htm. pages showing in the link drop down menu in the properties panel?

Please help!

I'm mocking up a quick website in fireworks cs6 . I 5 pages in my menu tab. Each one of these htm. pages show in my Link drop-down menu in the properties panels apart from the last one which is my contact page. I'm creating slices and linking these up to the correct htm. pages, but not all of the htm pages I have created are appearing in the list? Can anyone please help?

Thanks

Gemma