This was a bug in SU6 which can affect all aircraft and causes both the interior and exterior models to be drawn. You can get around it by switching to external view and back. For some people it doesn’t happen very often, but for others it happens a lot and is quite annoying.
It should be fixed in SU7 but in the mean time it is likely that the next update for the JF arrows and warrior will be out this week which will include a workaround for the problem. Since you bought from the marketplace and the marketplace is very slow to push out updates you probably won’t get that update until after SU7 anyway though