Congrats on your first post, and welcome to the forums!
Disclaimer: I do not have an AutoCAD version that old (I work with 2006 & 2009), so forgive me if I describe a feature you do not have.
Assuming you have added the vertical portion to your horizontal alignment, from the Profiles menu pull-down:
In the resulting Profile Generator window, under 'Station Range' at the top, you should see the 'Start' station. Double check this to see that it is set for the beginning of your alignment.
- Create Profile > Full Profile...
Hope this helps!