I don't know if you are talking about the pockmarks in the mold cavity or the pockmarks in the acrylic toilet topcoat.

The pockmark of the die must be the problem of the die material, and the post-treatment such as tempering and nitriding of the die is not in place.

If there is an acrylic pit, you'd better have a photo. There are many reasons, such as impurities/humidity/temperature/cooling system/plastics/additives, etc.

Hope to adopt