Whats wrong with quest items?

This is the second quest where i lost my quest items
When I have a quest like "The videre elixir",where i needed to obtain one videre elixir,but i got 3 of them as quest reward from the sub-quest,so i went back to finish "the videre elixir",and i should still have 2 of those videre elixirs becouse the quest needed only one,but it took all 3 of them,not just one.
The same happens with an ooze quest in undercity where i need to collect ooze samples in felwood and ungoro,so i collected some of them,went back to uc and i need to finish repeatable quest a few times using 1 sample each time,but instead it takes all my samples,the only thing i could use is my bank,put the samples in bank and take it one by one(running to quest giver and back to bank like 10-15 times)

So if in the future if I want to complete transmutation master alchemy quest for example,I will lose all of my primal mights if I have more than the neccessary amount(4 if I'm right).
I think this should be fixed asap.