Judging by your description, I think you encountered a similar issue with the featured contract or escalation completed challenge bug. They all share similarities of not rewarding players with unlockables, yet players have completed the challenges or made progression carryover which includes the corresponding completed challenges.
You can check out the below post for references and post yours under the same thread, but I am afraid currently there isn’t a solution to this except wiping all of your progression on the website here.