Restone unpredictable

The Redstone is 100% unpredictable, Redstone will do one thing one time then another thing some other time and is unpredictable completely. Doing something like double piston extending the simple way is unstable.  A good example of this is here - https://www.youtube.com/watch?v=h_5RddAlCok skip to around 3:59 and you will see that it is inconsistent with its self. This makes a large amount of Redstone require a lot more build around to make it function, flying machine's using observers are extremely unpredictable and will go up for 3 blocks then shoot down 4 then back up 2 and go down 1. There is something wrong that makes anything with moving blocks fail to work correctly.