I found a very uncommon problem which i spoke with mieuychan and i'm posting for fixing.
At lvl 44 after finishing the canine skin collection quest a new quest became available at magician minearm, which states for me to go to magician kihan in merac.For this quest u get experience and a choice of 2 items.1 is physical attack potions and 2nd is physical defense potions.I chose the physical defense potions because i dont hav those in my inventory.And when i check my inventory for details , it just wasn't there.And the same amount of the other potions were still there so i did'nt get anything from that quest , but experience points.
Please look into this broken quest problem and let me know if i can get my physical defense potions, once this problem has been resolved.
Thnxs for all your help and efforts to make this a better game