THe only reason this would happen is because you have a code error somewhere. Either check with firebug or any console or check at the bottom of your stage if you have a red x showing there is an error.
CAn you post your files?
There is an error on trigger 250s
You need a comma between 'absolute' and 'top'
What do you exactly want it to do?
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It is good to remember that when there is an error in code, the composition will play the whole timeline no matter what. So when that happen, you need to review your code and correct it:
From code window you can check all your lines:
or you can see the red button under your stage and it you click it you can see where the error is. The arrow next to it on the right will take you to it:
Of course you should also consider using your browser console. You can also add firebug to Firefox and other browsers.