You're going about it wrong. In your framing specification, you have set your floor joist at 11-1/2" below your floor. Your floor level is 0, so with 3/4" plywood, the floor joist should be -3/4", not -11.5" as shown. In order to accomplish what you are trying to do, leave your framing alone, and the let CA do its magic.
All you need to do is:
go to your foundation plan, select the concrete wall where you want the joists hung, Open up the wall dialog box Select the structure tab for that wall Under "Platform Intersections" check the box "Hang floor platform above on wall"
Remember, your floor is always zero, so when you changed the floor joist to -11 1/2", the floor stayed at zero, and your joists dropped down. Hence the gap. Follow the method I outlined, and your concrete wall goes up with the joists hung as shown in your cross section.
Hope this helps