Hey there @SkyNicarum! Welcome to the community! Oh that is quite odd! Did you use the migrate tool to pass these over to the new project or did you drag and drop the uassets directly in the folder structure? I’d usually recommend the migrate button as it accounts for all possible metadata and any resources the asset may need.
That said, check in the asset’s main mesh file to see if it’s distorted there or only in viewport. If it’s fine there and only distorted in viewport, it could be a floating point precision issue if your actor is too far from the origin (these errors start at 3km - 5km for non large world coordinate worlds).
If it’s neither, it could actually be a migration issue with 5.1, but generally there shouldn’t be any issues with transferring static meshes in general.