There are a thousand different reasons you could be experiencing glitching. Any combination of components may be just out of spec enough to cause glitching. Loose or bad connections can cause glitching. Even having the wrong two wires touching, or too close together can cause glitching.

Move the receiver and ESC as far apart as possible. Avoid having power wires pass anywhere near the antenna or receiver. Twist power wires together. Check all connections. Disconnect individual components (i.e. servos) one at a time and test for glitching.