Hammer Decal Problem

Alright, so I just started getting a really weird problem with hammer. Every time I place certain decals (lambda sign, trash, overall about half of them) in my map, they end up tiled four times. This doesn’t happen anywhere else, and doesn’t happen if I delete my whole map, which is obviously a less than optimal solution.

Any ideas what the hell is going on?

Apparently it’s only in hammer, compiled maps don’t have this problem. Weird, but ah well.

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