Hi,
Are you dumping a static scene from a playback, or does it contain multiple cues?
For any static scene I would dump right out of the programmer instead of using a playback. Just clear everything, set your fixtures in the programmer, press dump, type the track number and press enter. This dumps a single frame of DMX, which can later be modified using the console on the web interface.
If you dump with a playback, make sure the speed of the playback is set to default. (right click on it to be sure, it should snap back to default)
The dumping process currently does not take the speed fader into account, which will cause the recording to be either too long or too short.
If none of this solved the issue, can you share your showfile?
Greetings,
Bootsy