Time problem

hi guys,

i was making this movie on a friend of mine and it transafers from one effect to another base from the time elapsed from the last effect. my question would be that how come when i test it “Ctrl+Enter” the timing was perfect but yet when i published it the timing seems to be off a couple of second. how could this happen?? and what could have caused it?? i would really appreciate the help or explanation…thanks