Hello @Soldier_of_Dawn thank you for providing that video, I can see how this bug can be rather frustrating.
Just to clarify that I have understood the issue correctly, when entering the customization options for one of your heroes, sometimes the game can bug out where it will show the same rewards multiple times via a notification and your heroes progression will temporarily appear as locked or level 1, which forces you to have to shut down the game and restart.
Before I report this issue to our devs, have you performed any troubleshooting to check if this issue is being caused by a corrupted game file? I would recommend trying to verify your game files within the Connect launcher to see if this can easily be fixed > https://www.ubisoft.com/help?article=000060529
Should this step not work, please let us know and we will ask our devs/QA team to investigate.