Movement speed slow bug

I was just playing a game as Garen and I noticed throughout the game I was becoming slow for some reason (I was not near enemy with Frozen Gauntlet AOE, yet my move speed was being lowered for some reason). Has anyone else experienced this? Here is the link to my game: http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2366887603/204378108?tab=overview Maybe the bug is a result of some item combinations or something?