So I have found a workaround for the influence rank 5 bug. Everyone should follow and do this so no one will have any issues with this bug. It fixes it for everyone even those who already have the bug.
- Download the file from here. Virus scan is here.
- Go to Steam and right click on your Warhammer 40,000: Inquisitor - Martyr game.
- Click properties.
- Click on Local files tab.
- Click Browse local files.
- Open Cfg folder.
- Open OpenWorld folder.
- Delete CaligariSector.cfg
- Add new CaligariSector.cfg
What this does is it replaces the reward from the item that is posted in-game instead to reward fate. It gets rid of the open item error message and allows you to continue playing. This is only a temporary fix until dev's fix the item. But it works for everyone. Enjoy! :)