Diagnosis
No, excessive wobble is not normal. The crossbar may not be tightened properly, or the floor is uneven causing the feet to not sit flat.
How to Fix It
Lower the desk. Check the two large bolts connecting the center crossbar to each leg assembly. Tighten them with the provided Allen key. Then check the four bolts where each foot attaches to the leg. Tighten all eight bolts.
If That Didn't Work
Your floor is likely uneven. Place a carpenter's level on the desk frame. Use shims under the adjustable feet to level the desk. This stabilizes the entire structure.
Heads Up
Wobble is worse with a concentrated heavy load like dual monitors on a single arm. Distribute weight evenly. The desk is stable when properly assembled on a level floor.