I’ve bought these screws, but noticed that even when I use clamps to keep the pieces together, these screws will lift up the first piece a little bit, creating a gap.

Is this normal? How can I avoid this?

No, this is not normal.

It is not normal. This is a common problem with a lot of screws. This shows poor-quality screws. No type of screw should create a space between them. This is wrong, which can lead to damage to the object. From the moment you encounter such situations, you should change the screws. In general, we must pay special attention to the screws. I started buying only quality screws some time ago when I realized how important it is to buy quality screws. Since then, I have bought screws from, and I have no problem.