Hi there! I hope I can help you with your problem.
First, I would recommend saving your game and restarting completely. That has fixed it for some others.
If this is Xbox, I would recommend pressing and holding the Xbox button for about 5 seconds to power off the console and then unplugging from the wall for at least two minutes. This clears your cache.
I haven't heard of this for PS4. If this is PS4 I would recommend the database restore at the bottom of this FAQ.