Artifact fragment bug in new patch

Hello guys !
We are playing in a guild everyday together , after this new patch we are finally getting artifact fragments from the dungeons but still only from killing faunas… the first 5-6 players after the wipe takes maybe 20-30 minutes to get 3 artifact fragments and after that nobody get fragments from mobs or faunas or completing dungeons. When we invited a new player to play with us suddenly he got an artifact until he collect 3 and after that no artifacts drop…
Can you explain the artifact fragment drop rate from the mobs and from the faunas , and what is this maximum 3 fragment limit ? I can send you 4 pictures players capped at 3 fragments if you need.