Hmm, I could replicate something like that when the 2nd layout has "Every x Seconds" conditions and it seems like the first occurrence of that event is calculated using the amount of time since the start of the game(instead of from the start of the layout).
How to replicate:
-[Condition] Keyboard-> On key press = Spacebar
- [Action] System -> Go to game layout
- [Condition] Every 3 seconds
- [Action] System -> Spawn tank.
- Start the game.
- Wait 3 seconds or more
- Press spacebar.
- First tank is spawned, without 3 seconds countdown.
I'm not sure if it's the same problem.. but if it is, you could try something like this:
<img src="http://img211.imageshack.us/img211/8721/97150102.png" border="0" />