There are some objects that would not store the mesh collider setting. For example, I select the object, add the feature and then test it in the game - everything works, however some objects loose this property after I build a webgl project. What could be the problem?

Also, something weird is happening with the Clamp Vertical Rotation feature. I am able to look up and down when I test the game, however, after I build the WebGL project, the vertical and downward look is restricted. I am using the default first person controller of Unity 5. What could be the problem here?