first i have to sory for my English ofc

I have one question about cue. I want to do my first lightshow, but have a problem with synchronization two sequences (before 1minute of my lightshow, i want to play two lamps on the same time). When i set timecode Elapsed on that lamps to 00:00:01, first lamp play's for 1 second, them second lamp runs and first shut off.
What i'm doing wrong?
Thanks for your answers.