Graphics Trouble during replays

Hi ! I spoke with RiotGameSupport on twitter and they advices me to report a bug on this forum so I do it. First , I notice a bug when you look your replay ( profil --> download your game --> watch the replay ) , when you come back 15 seconds back or you want to go at 7minute game ( it's an example , it's work with other minutes ) , I noticed on the mini map you have no turrets only nexus , inhib and you didn't see any champions on the map and on your screen. When a events passed ( like : kills / turrets down ) you have a blue cube on the texts 0 turrets & champions on mini map only nexus ; inhib and didn't see any champions on your screen : https://plays.tv/video/59f13ab05930de6d3d/bug Before I press on ''15 seconds back'' 13:20 ( I did a double kills ) : https://t.co/X1P35oRjOp After I press on ''15seconds back'' the texts has a blue cube on him : https://pbs.twimg.com/media/DNBxlumX4Ao4zyN.jpg Like Riot asked to me if I have overlay or anything . I didn't have overlay or anything because I didn't theses bugs before and I didn't change anything in a client so I think the grapichs trouble it's a client who has a bug.

Thanks EverStray Sorry if my English is bad , i'm french :D