Problem importing fbx from Blender


I have a problem with the fbx-models i export from Blender. If i import them in to Unreal Engine everything looks good, but when i look at my project on a other computer, all the materials switch places like this:

I figure it has to do with the fbx-file it self, but don´t know what i do wrong. The “main” model always work well, but it is the LOD models that go crazy with the materials. In Blender I always keep the same order on the material for both the “main” model and all the LOD models, but it somehow seems to get mixed up when exporting.
Thanks in advance!