theICEBeardk

Yeah I am seeing that too. It is easily reproducible and it happens for regular melee, incarnon melee and zaws from my testing. It happened recently and often is accompanied by entering the weapon mod screen and the game reporting that damage or some other stat is being lowered by being marked as red even though nothing has been touched or changed in the configuration.

I have the same problem. Completed a normal nightwave challenge (Survival 20minutes) and I got a reward for it, but I completed the permanent weekly Kill 30 Eximus challenge at the same time and that gave me no reward.