Check to make sure your Post Process Volume is set to ‘Unbound’ as well. If you would like to see if it is your post processing that is causing the issue, you can toggle it off by using the ‘showFlag.PostProcessing 0’ console command.
If your problem no longer persists, then we can deduce that the issue lies somewhere with your post processing.
Let me know when you have tried this suggestion, and if it was a viable fix for your issue.
Cheers,