Hi Salmonei
I found the problem and fixed it recently. If you download the last version, it shouldn't happen anymore.
As for removing existing ones... well, it is not that easy, you have to work in the console.
If you don't know how to do it, I'll try to write a code, but first, answer
1- can you select the item to remove?
2- can you build something on it?
I cannot remember what the item was, so it would help me to write the code
Thanks
Niko