I have no idea how you get that misalignment. I do exactly the same as I told in my previous post: roughly drag the models in place and use align side-by-side to put them together. Everything aligns perfectly, both at the top and the border:
Could you start a new project and simply try the same models and alignment method?
Maybe set the preferences to the decimal system to compare with the numbers in my image. I don't think the imperial system itself can cause this, as far as I know it is always decimal in the background.
If that does align as it should there is something else in your project that causes this or the dishwasher was accidentally resized.
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