I have a problem I never noticed before and I do not know if it is a problem of Stacks, Foundation or RapidWeaver (or a problem caused by myself):
I build a Foundation project. I place content into a 1-Column stack - there are no special settings, no margin, no padding. The Styles stack is the default stack without any changes. Everything seems to be O.K.
Now a make a partial from that (no changes with the settings) and the content will jump to the left.