[GAMEPLAY] Smite recharge stopping at 1 stack.

I played a game of blind pick as Lee Sin jungle on the blue side of summoner's rift and part of the way through the game noticed that smite was only refilling to 1 charge. From the start of the game i bought hunter's machete, three health potions, and a warding trinket, i also immediately got marked by the enemy kindred. I smited and killed the Krugg's to start. Later on I built tracker's knife (with warrior enchant) as my jungle item, it was around this time that i noticed the bug. I'm not positive if it started happening at the beginning of the game or later on. This bug occured on NA. I'm not exactly sure what caused this and haven't been able to reproduce it since i first encountered this bug. As of this post I've only encountered this issue once