Once stairs are placed in build mode, they cannot be moved or deleted

yo same problem. try this: 1) "boolprop testingcheatsenabled true", 2) then shift + right click the stairs, 3) "force error", 4) then "delete". you only have to do it once with staircases, but with connecting stairs, which are the smaller ones, you'll have to do it for each individual tread. after this, you will be able to place new stairs, and they won't be glitchy or anything.