Sphere appearing in the middle of the screen when built

Hi all,

In the editor, the game appears as normal. But when we build it for either pc or android, a sphere appears in the centre of the screen!
We have no idea why it is been rendered there as we have not put any in the scene!

Screenshot is attached with the issue, any help will be really useful.

Many Thanks,

bump. Sorry just really do not know how to fix this!

It looks like the mesh for the spectator pawn. Is spectator pawn still the active pawn in your game mode at game start?