Possible Cause: The spool wasn’t released at the right time.
Solution: When making a cast with a star drag reel, place your thumb on the spool to prevent line from coming off while flipping the Release Lever down to the release position. Bring the rod back and then forward in one swift motion, releasing the spool during the forward motion, allowing the bait to be cast. Preventing backlash takes practice! ;You can use the tension knob for cast control, by slightly tightening the knob to apply resistance to the spool.
Stop the spool with your thumb as the bait enters the water. Now flip the Release Lever up to the engaged position and slightly turn the handle to put some pressure on the spool to insure it is fully engaged.
Possible Cause: Not enough pressure on the spool when casting.
Solution: If you are letting out a bait, such as deep dropping, keep slight pressure on the spool until the desired position is reached to prevent backlash. Some models contain centrifugal brake weights on the spool to help prevent backlash. These are designed to optimize casting distance, but can be removed if desired.