Weird mesh/shadows with scenes in assetbundles

I’m currently working on a project for a 3D view of some mattresses.
Our team uses scenes to display each mattress individually and each scene goes to one assetbundle.
But I’ve been banging my head on the wall for the last two days with some problems. When a scene is loaded, the mesh, shadows, materials, are all messed up. If go to the scene view, I can see that the mesh as been deformed. The image below shows the scene view on the left and the game view on the right of the same mattress/scene.

If I change/reapply the shader on the mattress, the mesh gets fixed, but I still get strange shadows and a slightly differente color. The image below show the mattress (on the left) after I reapllied the shader its top layer. There are some shadows being cast on it, even when there’s nothing around (the scene is totally empty aside from the mattress). On the right side, there a screenshot from the scene view of the same mattress when the scene is loaded without an assetbundle.

Nothing wrong happens when I load the same mattress (prefab) from an assetbundle. This only occurs when I load a scene from the assetbundles.

Same problem in Unity 2019.1.14 with asset bundle scene (packed with Unity 2018.4.11)