Item bug pls fix

Patch 8.24B shows that this Item heal and shield power increased from 5 to 10%. Thats wrong. I tested it in the sandbox mode. I played a test game in the sand box mode. I placed a friendly dummy in the enemy tower with Soraka. My masterie was Guardian. My shield was exactly 72. Now i buyed and i shielded 75 damage!!!. Now i buyed just micales which now has a 20% better shield and heals. This time i shielded exactly 86 damage which is correct. I also buyed ardents which should increase now my heals and shields to 10% more. Guardians lvl 1 with Soraka and ardents should shield 70 + 15+ 2 +10% now and yes the shield was about 95. So this is correct too. After the changes this item should shield in this example 79-80 and not 75. I also tested it now with janna shields. Jannas shield is 70 and with this Item, but i just shielded 74. with micales for example i shielded 84 which is right. I know in this examples the difference is not huge but in the late game it could decide between win or loose. So this Item has clearly a bug, the shield from this Item are 5 and not 10%. i am sry for my bad english here but i hope the intention and arguments behind this post are clearly understandabel.

LG SpieleAufDeutsch Support main btw. Also a Merry Christmas to you all! :D