Help!

Help!

My roommate and I have been living in our current apartment for about a year, and we decided it was time to have the carpets cleaned so the high-traffic areas of our home didn't look so grimey and grubby in comparison to everything else. Several years ago, we purchased a wooden ladder shelf from Ross that we've been using to store books in the living room, but upon moving it today so the cleaner could get at that corner, I was mortified to discover the ladder's feet have left neon yellow rings on the carpet. Initially, I thought it might be urine and that our cat had started marking behind our backs, but there's absolutely no smell and the carpet feels exactly the way it should -- it isn't stinky or crusty, just a different colour.

Has this ever happened to anyone else? The cleaner hasn't arrived yet, and I'll ask his advice when he comes, but I really don't want to lose a chunk of my security deposit like this (or all of it, if the landlord decides the carpet needs to be replaced). We've had the shelf for many years without a problem, but all the other places we've lived in have had laminate flooring -- this is the first time we've had it on carpet.

Mostly, I'd like to know if anyone has any suggestions to prevent this from happening again. It's a really nice piece of furniture, and I don't want to get rid of it if there's a way I can modify the legs or put something under it without having it be really noticeable.

Thanks!

UPDATE: The carpet cleaner has come and gone, and while the rest of our rug looks great, the rings in the corner remain. He thinks there was varnish on the ladder, and that the humidity in the air caused it to transfer from the wood to the carpet. I definitely won't be putting any other wood furniture down on the rug unless I've covered the bottom so this doesn't happen again, but he didn't have any suggestions on what to do about the stains. Google recommends amyl acetate, but I'm hesitant to do anything just in case I might somehow make it worse. Are there other options available like hiring someone to cut out the damaged section of carpet and replace it with something that isn't?

neato bugs and some other garden photos

neato bugs and some other garden photos

spring yard pics

spring yard pics

room

room

what is it?

what is it?

Bulb identification

Bulb identification

Color for our new place

Color for our new place