Club Penguin Stage Igloo Item Glitch?

Hey penguins! When I was editing my igloo on cp today I saw something really strange under the rugs category. Here is what I saw.

Strange huh? I only had 3 of those yet I could put down as many as I wanted without paying! It is really strange! I also could put them away without worry! I was really confused! Does this happen to you too? Do you know why it happened?
-Flamealgs