I Think I Broke Build Mode

I was transferring some Lots from one game save to another... instead of clicking on the lots and entering into build mode to place each one, I did it from the world map view, ie. clicked on the lot in my library, selected to place it in the world map view and then I get the 'building lot' load and the lot gets placed down without me ever entering the lot. Everything seemed fine, so I did quite a few of them this way, but then...

Build mode now seems broken. If I enter a lot in build mode and want to edit something, the sledgehammer doesn't work. I can grab an item, but when I press the delete key it doesn't work. The bulldoze option doesn't work. Nothing in the lot can be sledgehammered, deleted or bulldozed. This has never happened before but, in the past, I never placed lots down from map view before. Has doing this broken my game?

I do not have any mods or custom content in my game at all, it is completely vanilla.