Objects disappearing when on top of certain textures.

I just downloaded the “Tower defense” project from the Marketplace and after compiling everything for UE4.24.1 and playing the Run button, seems that certain objects are not displayed when passing on top of certain textures. I can see only the health-bar from the top of the characters, but the characters itself seems to be hidden. How can I fix this issue? I just started to learn how to use UE4, so please excuse my lack of knowledge. Thank you.

I just rebuild and saved everything, not seems to be the opposite way! I can see the characters, but the background objects and maps are missing!

Another day, another issue. Now the characters are drawn correctly on top of the ground but now they are disappearing when they are over a texture that previously was’t any problem.