Issue with rotation values for imported objects

I have a Blender scene with 1 mesh, 1 camera, and 1 light. Rotation values for all 3 objects are 0,0,0.

I export the whole scene as FBX and import it to Qt 3D Studio. In Studio, the rotation values are the following:

• Mesh: -90,0,0
• Light: 0,0,0
• Camera: -90,0,-90

If I export as Collada and import to Studio, the rotation values are the same in Studio as in Blender.