No boxart is a totally different system
There doesn’t seem to be a current issue .
What game are you trying to load box art of can you cite some examples?
So I compared
https://static-cdn.jtvnw.net/ttv-boxart/515025-100x150.jpg
https://static-cdn.jtvnw.net/ttv-boxart/515025-1000x150.jpg
I cannot find an issue throwing arbitary width/heights in for overwatch