There are some very annoying redstone bugs when building redstone contraptions, I tried building a portcullis for my castle a few times and it didn't work, I even tried watching a tutorial and did it exactly as the video told and it still didn't work, finally I decided to see if the problem was the game and build the exact same thing on Minecraft PC and the contraption worked. When building the contraption on windows 10 I encountered:

• Sticky piston UNSTICKING from regular pistons
• Redstone charges not being properly transmitted
• Blocks when moved by pistons "glitch out" and never move.

EDIT : The "redstone charge problem" *(point 2) is referred to when pulling the lever back up, the upper pistons are supposed to push back down the blocks but it doesn't unless you flip the lever repeatedly but what this causes is for the gravel blocks to break

Please fix them as soon as possible,
here is a link of the tutorial i was doing in case you would like to try it out yourselves https://www.youtube.com/watch?v=hISevc8lq_g

If you need any additional information just ask!