Something wrong is happening with my game. I save the game on specific part of cenario, but when i use load game...always load in the start of cenario. Why? The save dont work?

It's a checkpoint based save system. The manual saving is only there to permanently save it at the last passed checkpoint. Basically you only have to manually save if you want to quit the game to continue later.

This makes no sense but this is how it works.

you have to manually save once you reach a checkpoint. Also, you can press f5 to quicksave your checkpoints.