Dave makes a good point! When you attach or add a compensator (muzzle brake) to a piece it tends to pull some of the gas pressure away from the recoiling mechanism. It diverts the pressure in the ports thus lessening the recoil. And also may also be alternating the the barrels ability to raise during the cycling processes well. DaleDon't buy more expensive ammo just to make the gun work with a silly attachment on the front (BRAKE, nor BREAK).
The weapon works without the silly muzzle brake, perhaps you should run it in that configuration. As to exactly _why_ your muzzle brake doesn't work, I have no idea, although it might be obvious with weapon in hand.
It could be throwing off balance
You could just be lousy at recoil control with a handgun
It could be interfering with proper position of the barrel while in battery
I'm just guessing, you don't provide much detail beyond "malfunction"