Hello CloudMonster,
Could you provide me with screenshots of your viewport in your Blueprint and in you Editor Viewport? Specifically the snap grid sizes you are using in their respective viewports.
Editor Viewport Grid Controls
Blueprint Viewport Grid Controls
Be sure that your grid snap settings are set to the same size, and when working in the blueprint editor, your root is set to 0,0,0 so it is not offset when placing in your scene.
Thanks,