MSI Icon only cost 1IP

{quoted}

does this supposed to happen? (1IP MSI icon)

click the link

Yes, they often sell event icons (such as MSI, Worlds, or All-Stars) for 1 IP for a limited time. You can check what kind of deals they are having on the News article for the event.

http://na.leagueoflegends.com/en/news/esports/esports-event/mid-season-invitational-icons-bundles-and-more

I wouldn't know my store doesn't work.