I think if I contacted a photographer for a service and then found some obvious loophole in their pricing and they quickly ceded, I'd really be wondering how long that photographer has been working professionally. I say this not simply to chide you for not having answers to these obvious questions (e.g. why an engagement session might cost more than a family session; why you schedule the amount of time you schedule for engagements vs. family shoots), but just to give you a heads-up that appearing wishy-washy and uncertain about the products and services you offer is generally not a good thing.
Assuming this is directed at me, I did have an answer. More money due to more time due to locations and the overall nature of the shoot. She only saw what was written on my site and thought it should apply to all sessions. She didn't read the next line that states for all other requests, please contact me. I did the 1 hour session as I felt my wording was misleading. This been rectified.