[Map] cubemap problem

Hi everyone. I have to problem on the map. On map appeared some strange cubes and I do not know how to fix them. I have to content:
Half-Life 2,
Half-life 2 EP 1
Half-life EP 2

It’s cube on map is for CSS

Did you create the map or did the map or is it someone else’s?

[editline]21st September 2015[/editline]

If you did make the map, then I had a similar issue a while back on SDK Hammer, where I used the Hammer.exe from the counter-strike: source Bin, made a map with its textures, and changed to the Hammer.exe in the garrysmod bin to add npc’s, but some textures didnt work and made them shiny and blinding. I fixed it by changing the texture.