Description of the Bug:
I went to make an Item Rarity Excluder potion, and the resulting potion came out at the wrong grade. My intention was to make a potion between 60 and 70 grade, so I did the math and found the right materials. The resulting potion came out 83 grade? You can see the grades of the materials I used in this screenshot:


Steps to reproduce:
I would assume the reproduction steps would be to craft an Item Rarity Excluder potion without using all g100 materials, do the math, and see what the result actually is. I'm not personally inclined to waste my remaining materials by trying it again and getting another potion I can't use. It seems like it's using an incorrect formula to generate the grade of the potion, possibly related to when the potion's recipe was changed months back (formerly used 2 flowers, 4 voxels, 1 varadium)

What should have happened?
The resulting potion should have been either 63 or 64 grade, per the math below
8 x 31 grade Voxel Fruit = 248
1 x 100 grade Aquamarine Stew = 100
2 x 100 grade Varadium = 200
4 x 100 grade Pumpkin Flower = 400
15 items, total grade = 948
average is 948 / 15 = 63.2

What did happen?
The potion result was 83 grade, too high.

My System:
PC, Windows 7, Firefox