Your walls have not moved. Screenshots show two different View Settings (one of them has dimension rounded to 1/8", the other one to 1"; also door labels are displaying differently). Dimension preferences are set in Options>Project Preferences, and then selected in View Settings.
[Also: those walls are not modeled accurately to an inch (probably neither to an 1/8"), and dimensions displayed rounded values as you placed them because that was the dimensions preferences active at that point; so also check out how to accurately position stuff with x, y, etc. input, coordinate box, working units. Probably you should check out the whole concept of Views too.]