Because it is a program that "modifies" other programs (your game), your anti-virus may think it is malicious and try to block it.
This is why we usually disable protection or add it to the exceptions list.

Our hack is safe from PunkBuster, but if you are caught by Metabans - this is most likely your fault.
A way to avoid this is to not always use magic bullet, instant kill, and things like this.

You can check your stats by checking Cheat-O-Meter (if your meter is very high you will be banned automatically by any server streaming Metabans)
For Battlefield 3: http://www.team-des-fra.fr/CoM/
For Battlefield 4: http://bf4db.com

Here's an example of what a cheater looks like: http://bf4db.com/players/45455


Most users that are banned are usually at their own fault. Play smart when you use cheats and you won't have any issues.