Greetings Ziggurat!
Thank you for reaching out to us and welcome back!
Situations like yours may occur due to the usage of Mods in your game. As such, we suggest that you uninstall your Mods completely in order to see if your game returns to normal.
If after doing so the issue persists, please send us a screenshot of the stairs and railings that you’re using in the manner in which you’ve placed them, please! 