Item Set bug (1.5 years now?)

There's a bug that although isn't largely impactful, it's still nasty in its own right. Whenever you use Item Sets, the game tends miscalculate how much gold you have when you visit shop. You have say, 984 gold, and when you open up shop, it shows you have like... 174 gold instead. After like, 3-5 seconds, it reverts to normal but those few seconds are precious in the fast-paced League environment. Whenever I'm not using item sets (after reinstalling or such), the bug is no longer there so it's definitely Item Set related. KateyKhaos please? D: