Ran into two issues, which might be related to each other.
https://i.imgur.com/DyxcgUC.jpg

When I tried to create a blueprint of the above layout I didn't get a prompt to give a name. Instead I got the layout selected as placable (as if I had hit that layout's button) and the layout Blueprint_1 appeared automatically. I tried two more times with the same result, except now they were called Blueprint_2 and _3. The fourth time I tried it I simply typed the name I wanted the blueprint to have and hit Enter and it created the blueprint correctly.

The second issue is that none of these four Blueprints can be renamed or removed. When I right-click them I get no pop-up. The pop-up appears normally for my earlier blueprints. I tried rebooting the game and reloading my save file but noticed no change.

Is there a way for me to manually remove these blueprints while you work on a solution? Are they stored somewhere as a file in the installation folder on my PC that I can just delete, for example?