DWG drawing fall apart after import?

Hi all, the lines are displaced after the import, as shown in the image below.

I guess this has something to do with the CAD drawing itself since no other drawing has this problem importing into SU.
I have tried to import CAD blocks separately, but it’s very time-consuming since there are so many blocks and so many blocks within blocks, and some lines would shift as I mentioned once imported.
Any advice or explanation why this is happening? I’d appreciate your help.

What does the DWG look like in Model Space in AutoCad? Was it exported from a BIM application? Can you post the DWG? Are the lines in the DWG very far from the model origin?