Issue with using a client on latest launcher update

When I hop onto a server, such as Hypixel. It appears like someone has 100 block reach. They don't. I tested this on a practice server and fought a bot. It also had 100 block reach, and sometimes the bot wouldn't even move and I couldn't hit it. I use the Hyperium client, and when the launcher wanted me to update it, it immediatly gave me a warning sign when I clicked on it. Probably the issue but, I just wanted to report that in case it hasn't been reported or fixed yet.