If the gate on the mold is designed properly, or in this case opened up, it will not freeze off before the bait does, allowing enough plastic to be pulled in to the cavity as it cools and shrinks. when that gate is too small as in this case, it will cool and solidify not allowing the bait to draw in the plastic it needs. This has been shown by a few that have slightly opened the gates of this particular mold and completely eliminated this issue.