Because your glue position is too thick, the screw must continue to move forward to maintain pressure after injection. The thicker the glue position, the more serious the shrinkage will be, and the more material will be squeezed in during the pressure holding section. Because there is a time difference between the material that is filled in at the beginning and the material that is squeezed in after the pressure is maintained. The material that goes in first has cooled down, and the material that goes in slowly after the pressure is maintained becomes a pattern shape. (I wonder if the problem is as you described?)

If so, I suggest you 1. Try to reduce the thickness of the glue position, such as making anti-shrinkage holes. 2. If thinning is not possible, the glue entry point can only be appropriately enlarged. With a glue thickness of 30mm, it is very difficult to injection mold regardless of the process. 3. Segmented injection, the first stage is slow filling of the material handle, the second stage is fast filling of the cavity, and the third stage is slow filling of the cavity. The injection time should be as short as possible and the holding pressure should be large.

(For reference only, the actual adjustment plan will be determined based on the situation)