Tools not working on the ground

Hi! None of my tools seem to work when clicking on the ground or any other map location,like wall etc(im mean lamps,ropes you get it).I can only attach these things to other props.Another example is that I cant weld any thing to the ground.Or attach a lamp to a ceiling.I have to spawn a prop and lock it.

However,spawning props and everything works fine.Just the tools.This is really frustrating.How can i fix this?