[Gameplay] Sterak's Gage shield instantly disappears.

So... i was playing with Gnar, had Sterak's Gage between my items and it totally bug, the shield would instantly disappears whenever it activates, the shield would** NOT** take any damage (or so it seems), it would only visually appears for a little less than half a second, the champion would grow in size and gain the extra AD but the shield would not work as intended, this happened in a rank game.

Here's a video of 3 moments in the game when the Sterak proc, all 3 times the bug would occur, i thought of selling the item and buying it again when happened the 2nd time, but didn't have the gold and later i forgot, the third time this happened we totally lost the game so it didn't matter to re buy anymore.

The 3 times this happened in the video i take a twitch AA that Looks like take the shield out, but Twitch don't have that much damage, he should only take 1/3 or the shield at max, but in the video looks like he take the full shield and plus his normal damage to me.

My summoner name is ZNK (LAN).

Thank you for reading. Sorry for bad english, if any.