So you have one string of pixels ... 14x30 ... connected to output 1 on your controller.
So your model should be something like
1 string, 420 nodes, say 14 strands/string.
but i dont think you shared these settings.
You have it setup on absolute start channel 1 ... (although i would use #1:1 but it makes no practical difference at this point).
So it is using 1260 channels. You have it configured at 2048 channels ... which is odd but again ok.
The controller connection properties in xlights are entirely irrelevant and should be removed as they are only used for controller upload and you are not doing that (but again it wont hurt anything).
I am beginning to think it is something else ... have you tried render all?