CANNOT undo shop purchases at game start

This happened in my ranked Lux game just a moment ago.

And it has also happened in the past. I reported it but I doubt anyone minded it.

I started a game with my teammates, I'm not sure how, but I ended up with 3 potions. Now I don't think I bought three, but that's trivial. I may have just accidentally done that. But after buying 3 potions I cannot undo them, so I'm stuck at 350 gold and unable to purchase a Doran's ring.

All i can think of is I put a point into my E... which.. I always do.... and I may or may not have cast it. That Shouldn't do anything.

So yeah I opted for a dark seal, for the first time ever.

But yes, this is a serious bug, especially to happen in ranked.