Lost progess when try to unlock new DLC weapons

Product: Battlefield 1
Platform:Sony Playstation 4
Summarize your bug Lost progess when try to unlock new DLC weapons
How often does the bug occur? Occasionally (10% - 49%)
Steps: How can we find the bug ourselves? Try to unlock weapons for the supporter (Chauchat Telescope) or sniper class (Lebel Model 1886 Sniper)
What happens when the bug occurs? For both weapons the reached progress in getting x headshots in one round was reset on the next day
Please select your region Europe
In what game mode did the bug occur? Conquest
AMD or Nvidia Model Number
Enter RAM memory size in GB

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Hello there.

Yesterday evening I tried to resume the unlock for 2 of the new weapons in the They Shall Not Pass DLC. I already reached 15 headshots in one round with the Bénét-Mercie and 5 headshots with the russian 1885 two days ago. The progress was shown in any case. So yesterday I tried to make the rest of the tasks and ... WTF!!! The progress was 0/15 respectively 0/5.

So now is the question: Is it a bug or simply a problem of the order of the tasks? I remember that we had similar issues whith some assignments in BF4. You had to make the shotgun kills after making x shotgun ribbons otherwise it doesn't counts.

Greatings from Germany

And by the way:

Great DLC!!!