Hello, in the Ordanance Corps event chain the event “Salvage damaged armaments to build bombs” the NPC Beigarth is buggy.
You have to spam interact to give him the salvage. And that for an extended time (20s+).
Also while you are at it please look into the scaling with low numbers of players.
https://wiki.guildwars2.com/wiki/Salvage_damaged_armaments_to_build_bombs