The lob bugged on Amara apparently

It seems that the lob has some bugged interaction with Amara or at least i noticed it with her happening.

I can’t really explain what triggers it but when playing this weapon after a while it doesn’t do any dmg this can be fixed if you activate action skill.
Right after cast the dmg seems to be right.

Happend quite a few times now so i wondered who also had experienced it.