This also happens in C3
When the space bar is pressed, the trigger contained in the "else" is executed even though the initial condition is true, this means that the "else" must never be executed.
The capx only has one sprite, the keyboard plugin and two conditions.
STEPS TO REPRODUCE
Press the spacebar and check how the sprite is located in X 400, this means that the trigger contained in the "else" was executed
Only the trigger should be executed in the initial condition, the trigger in the "else" should not be executed.