I was creating a minecraft custom super flat that was as follows:
Piston(facing down)
Air
Block of redstone
Piston(facing up)

*What I expected to happen was that the pistons would go back and forth once I updated them and my game would slow down and possibly crash

*What actually happened was that the piston(the bottom one) triggered once, and the other one didn't. Fine, but the wierd thing was that the arm of the bottom piston was both up and down and if I removed the base of the piston, the arm would appear. Also, a pattern of rings would sometimes appear with blocks of redstone being down instead of up as all the other blocks were

Steps to Reproduce:
1. Create a super flat with the custom settings listed above
2. Update a block of redstone
3. Wait until the game responds
4. Break a hole in the pistons and check them out