IP gains/losses taking a while to register

I noticed this issue a few days ago when I bought MF in the store, and again just a few minutes ago, where some of the IP gains/losses weren't accurately represented on my account. For MF, it initially charged me twice for the champion, and a few minutes ago, the gain from winning a game didn't register either. Both times the issue was corrected by just restarting my client, but I wanted to bring it up just to prevent potential confusion for some users. Thanks