Disable Mundo... invisible cleavers
Mundo's bugged right now, read the title and do your job riot.
2 Comments
How to report a bug according to Riot;
How to Submit a Bug In the title, briefly describe the bug and tag it as either [GAMEPLAY], [CLIENT], or [CRASH] In the body of the post, include a more in-depth description of the bug you are encountering. Follow up the description of the bug with numbered step-by-step instructions on how to reproduce the issue. Include how frequently you can get the issue to occur and any video or screenshots of the bug that might help clarify it. You can find a good example of a bug submission here
As a Summoner reporting a bug, you have not done YOUR job, so don't expect Riot to respond to this.