Problem in the Viewport

I’m pretty sure this is a silly question but here I am.
I was working on UE 5.3 and placing my meshes to create a blueprint…so far everything was okay. At some point, the mesh on which I was laying my other meshes stopped working (I couldn’t longer lay the object on the surface of that mesh) only that mesh. when I try to place a mesh it goes straight through it, when before I could lay an object on top of it.

I appreciate any help you can provide.

Hey there @S1_TheLord! Welcome to the community! Are you talking about the vertex sliding when trying to place meshes inside the BP window? Does this apply outside of the BP viewport (ie in the level viewport).