Rail disappear

Rail disappear when piston are off.

Here is the video (bc the video is too heavy to put in here): https://drive.google.com/file/d/1uHU7kmMZjs5GSspkCAwKHqf1W0XnB2f8/view?usp=drivesdk

Tell me if the link are died , if they do . I'll sent an mediafire one

Thank for reading, sorry for my English is kinda bad , hope you are understand