Happens when you place signs from the Deco tab of Pandora's Box. To prevent it go to the Items tab, Construction then Signs. For street/direction signs, you may have to refer back to the ones in the Deco tab, but place them from the Items section and you can avoid this from happening.
Vorspire suggested I pm you regarding a world builder/deco staff position. Is this the correct way of doing that? I've got some time to spend and am feeling the itch to bring some UO visions to reality. I would to speak to you regarding the server to see if there is a place for me there.
I'm a world builder, not a developer. But I'd love to work on a project that actually comes to fruition. I have access to the most recent EA artwork and some custom stuff that I'd love to be able to use to build/landscape with.