1. There is gap between wall and the laminate flooring accessory. This is because the location of nail is not reseasonable or the wall is not even. You can insert more nail or use some special padding material to insert the gap.

2. The height different is too much at the joint. This is because the installation method is not correct or the subfloor is not even. You can install again in correct way or make the subfloor even first.

3. The laminate flooring accessory push up at the joints. This is because there is expansion space when the air or the wall becomes moist. You can take the accessory down and offer the resonable expansion space when install the new accessory again.

4. There is white dirt in large area on the accessory. And the white dirt is not easy to be get rid of with special tool. This is due to the quality problem of the accessory.  You can require the seller or relevant manufacturer to replace the product.