Imported Assets downscaled to incorrect dimensions

Hi, I am importing custom assets (Epic Isometric map elements) to the Map Layer without grids. I upload them to my library from my desktop and then place them on the Map and Background layer. When I do, all of them appear to be forced into some arbitrary size, which means that the original scaling of the assets is forced into new dimension and the scaling is off. Way off. Am I doing something wrong here? Again, assets are being re-scaled to smaller and apparently arbitrary dimension when added to a Background layer with no grid. 

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