Stereoscopic 360 video: sphere problem

I’m trying to do a 360 Panormaic video with Unreal, but in the middle of the scene the rendering shows a sphere that I didn’t create, you can see a screenshoot of the rendering down here:
I can’t understand what is this sphere, it isn’t the player start, because I moved it down the floor to avoid this inconvenience.

Does somebody knows how to avoid it?
Thanks a lot!

I used to see that sphere while playing the sequence from sequencer.
For me it’s the last camera position (moving through world moves that sphere)
Try setup game mode other from default.