Alright...

I have a keycard that somehow turned into a container. There are multiple "open/close" options, but the system will not let me delete them. I have attached one of the error screens that pop up when I try to do anything with the object. Is there a fix for it, or do I have to create a new keycard and hide it within the game again?

You want to uncheck everything under the container tab.

Also check the item attributes and delete any that pertains to containers, like anything mentioning 'can be closed', etc. I discovered By chance that those attributes stay embedded on an object even after removing the container state which makes the item continue to act like one without you being aware of it. I'm typing via mobile, so please forgive my atrocious formatting an spelling.