Interior wall to exterior wall connection

[richfalt]

Hello everyone. I am pretty new to this program and I am having trouble with snapping interior walls to exterior walls in a drawing I am working on. The exterior wall is a ICF wall and the interior walls I draw are snapping to the exterior side of the ICF wall. I have the ICF exterior side located correcty so it isn't that. Does anyone have any ides on what could be causing this? I have a pdf. copy of the plan view attached.

Thanks in advance for any help you can offer!

Rich